{
 "version": "2026-07-09",
 "items": 447734,
 "rows_without_exit_month": 0,
 "months": [
  {
   "m": "2021-04",
   "n": 58
  },
  {
   "m": "2021-05",
   "n": 22
  },
  {
   "m": "2021-06",
   "n": 8
  },
  {
   "m": "2021-07",
   "n": 10831
  },
  {
   "m": "2021-08",
   "n": 15802
  },
  {
   "m": "2021-09",
   "n": 14050
  },
  {
   "m": "2021-10",
   "n": 6631
  },
  {
   "m": "2021-11",
   "n": 5620
  },
  {
   "m": "2021-12",
   "n": 5855
  },
  {
   "m": "2022-01",
   "n": 15397
  },
  {
   "m": "2022-02",
   "n": 13141
  },
  {
   "m": "2022-03",
   "n": 8109
  },
  {
   "m": "2022-04",
   "n": 13513
  },
  {
   "m": "2022-05",
   "n": 4636
  },
  {
   "m": "2022-06",
   "n": 8734
  },
  {
   "m": "2022-07",
   "n": 8453
  },
  {
   "m": "2022-08",
   "n": 18803
  },
  {
   "m": "2022-09",
   "n": 11468
  },
  {
   "m": "2022-10",
   "n": 15240
  },
  {
   "m": "2022-11",
   "n": 9196
  },
  {
   "m": "2022-12",
   "n": 13666
  },
  {
   "m": "2023-01",
   "n": 11436
  },
  {
   "m": "2023-02",
   "n": 3133
  },
  {
   "m": "2023-03",
   "n": 1992
  },
  {
   "m": "2023-04",
   "n": 5449
  },
  {
   "m": "2023-05",
   "n": 3496
  },
  {
   "m": "2023-06",
   "n": 2110
  },
  {
   "m": "2023-07",
   "n": 881
  },
  {
   "m": "2023-08",
   "n": 3031
  },
  {
   "m": "2023-09",
   "n": 7080
  },
  {
   "m": "2023-10",
   "n": 5981
  },
  {
   "m": "2023-11",
   "n": 2061
  },
  {
   "m": "2023-12",
   "n": 1198
  },
  {
   "m": "2024-01",
   "n": 597
  },
  {
   "m": "2024-02",
   "n": 1726
  },
  {
   "m": "2024-03",
   "n": 3018
  },
  {
   "m": "2024-04",
   "n": 4743
  },
  {
   "m": "2024-05",
   "n": 7463
  },
  {
   "m": "2024-06",
   "n": 20321
  },
  {
   "m": "2024-07",
   "n": 21612
  },
  {
   "m": "2024-08",
   "n": 16556
  },
  {
   "m": "2024-09",
   "n": 15600
  },
  {
   "m": "2024-10",
   "n": 3215
  },
  {
   "m": "2024-11",
   "n": 1345
  },
  {
   "m": "2024-12",
   "n": 26
  },
  {
   "m": "2025-01",
   "n": 20
  },
  {
   "m": "2025-02",
   "n": 92
  },
  {
   "m": "2025-03",
   "n": 1142
  },
  {
   "m": "2025-04",
   "n": 3234
  },
  {
   "m": "2025-05",
   "n": 7192
  },
  {
   "m": "2025-06",
   "n": 11805
  },
  {
   "m": "2025-07",
   "n": 15029
  },
  {
   "m": "2025-08",
   "n": 12071
  },
  {
   "m": "2025-09",
   "n": 2629
  },
  {
   "m": "2025-10",
   "n": 2734
  },
  {
   "m": "2025-11",
   "n": 7379
  },
  {
   "m": "2025-12",
   "n": 4545
  },
  {
   "m": "2026-01",
   "n": 2426
  },
  {
   "m": "2026-02",
   "n": 2500
  },
  {
   "m": "2026-03",
   "n": 2174
  },
  {
   "m": "2026-04",
   "n": 10111
  },
  {
   "m": "2026-05",
   "n": 7987
  },
  {
   "m": "2026-06",
   "n": 9695
  },
  {
   "m": "2026-07",
   "n": 1666
  }
 ],
 "range": [
  "2021-04",
  "2026-07"
 ],
 "fates": {
  "released": 304103,
  "rescued": 143631
 },
 "rescue_rate": 0.3208,
 "groups": {
  "Book": 352551,
  "DVD": 53077,
  "Music": 39924,
  "Video Games": 2182
 },
 "life_tables": {
  "books_with_full_records": 333355,
  "join_coverage_books": 0.9456,
  "age_at_exit": {
   "median": 20,
   "p25": 12.0,
   "p75": 29.0,
   "deciles": [
    6.0,
    10.0,
    14.0,
    17.0,
    20.0,
    24.0,
    27.0,
    32.0,
    38.0
   ]
  },
  "median_age_by_fate": {
   "released": 22,
   "rescued": 17.0
  },
  "by_birth_decade": {
   "1920": {
    "n": 116,
    "median": 102.0,
    "deciles": [
     95.0,
     97.0,
     100.0,
     101.0,
     102.0,
     102.0,
     104.0,
     105.0,
     105.0
    ]
   },
   "1930": {
    "n": 163,
    "median": 87,
    "deciles": [
     84.0,
     85.0,
     86.0,
     86.0,
     87.0,
     88.0,
     89.0,
     90.0,
     92.0
    ]
   },
   "1940": {
    "n": 261,
    "median": 77,
    "deciles": [
     74.0,
     75.0,
     76.0,
     77.0,
     77.0,
     78.0,
     80.0,
     82.0,
     83.0
    ]
   },
   "1950": {
    "n": 1007,
    "median": 68,
    "deciles": [
     64.0,
     65.0,
     66.0,
     67.0,
     68.0,
     69.0,
     70.0,
     71.0,
     72.0
    ]
   },
   "1960": {
    "n": 2635,
    "median": 58,
    "deciles": [
     53.0,
     55.0,
     56.0,
     57.0,
     58.0,
     59.0,
     60.0,
     61.0,
     63.0
    ]
   },
   "1970": {
    "n": 13912,
    "median": 48.0,
    "deciles": [
     44.0,
     45.0,
     46.0,
     47.0,
     48.0,
     49.0,
     50.0,
     51.0,
     52.0
    ]
   },
   "1980": {
    "n": 35318,
    "median": 38.0,
    "deciles": [
     34.0,
     35.0,
     36.0,
     37.0,
     38.0,
     39.0,
     40.0,
     41.0,
     42.0
    ]
   },
   "1990": {
    "n": 80216,
    "median": 28.0,
    "deciles": [
     24.0,
     25.0,
     26.0,
     27.0,
     28.0,
     29.0,
     30.0,
     31.0,
     33.0
    ]
   },
   "2000": {
    "n": 102678,
    "median": 19.0,
    "deciles": [
     14.0,
     16.0,
     17.0,
     18.0,
     19.0,
     20.0,
     21.0,
     22.0,
     23.0
    ]
   },
   "2010": {
    "n": 81413,
    "median": 9,
    "deciles": [
     5.0,
     6.0,
     7.0,
     8.0,
     9.0,
     10.0,
     11.0,
     12.0,
     13.0
    ]
   },
   "2020": {
    "n": 15519,
    "median": 2,
    "deciles": [
     1.0,
     1.0,
     2.0,
     2.0,
     2.0,
     3.0,
     3.0,
     4.0,
     5.0
    ]
   }
  }
 },
 "semantics": {
  "fate": "rescued = re-entered circulation through resale into new hands; released = left the resale stream into the reuse/recycling track. This register records each item at its last witnessed moment in this operation's custody — it is a death register in the tradition of the 1662 Bills of Mortality, not a census of living books.",
  "exit": "month the item was scanned out (day deliberately withheld)",
  "birth": "earliest print year found across Library of Congress and Open Library records (94.6% of books joined)"
 },
 "license": "CC BY 4.0 — cite: New Mexico Literacy Project, The Book Necrology"
}