Each publication is determined by its (publication) date. The corresponding time is given for about 15% of the publications.
| decade | ~0 | ~1 | ~2 | ~3 | ~4 | ~5 | ~6 | ~7 | ~8 | ~9 | total | proportion | cumulative |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1910 | 74 | 842 | 1 028 | 957 | 824 | 844 | 851 | 634 | 780 | 6834 | 0.03% | 0.03% | |
| 1920 | 810 | 830 | 711 | 786 | 977 | 1 406 | 1 960 | 1 673 | 1 765 | 2 102 | 13020 | 0.05% | 0.07% |
| 1930 | 2 157 | 643 | 1 877 | 2 063 | 3 159 | 1 790 | 1 301 | 1 801 | 1 720 | 3 009 | 19520 | 0.07% | 0.14% |
| 1940 | 2 332 | 1 768 | 1 746 | 1 729 | 1 865 | 2 504 | 1 770 | 1 623 | 31 | 1 881 | 17249 | 0.06% | 0.21% |
| 1950 | 2 107 | 2 207 | 2 272 | 2 416 | 2 697 | 4 432 | 3 149 | 4 948 | 3 591 | 3 549 | 31368 | 0.11% | 0.32% |
| 1960 | 3 669 | 3 933 | 4 204 | 4 541 | 4 886 | 4 665 | 4 797 | 4 342 | 7 760 | 4 994 | 47791 | 0.17% | 0.50% |
| 1970 | 4 389 | 4 204 | 4 229 | 4 226 | 5 343 | 5 404 | 5 134 | 5 762 | 5 878 | 7 249 | 51818 | 0.19% | 0.69% |
| 1980 | 7 930 | 270 | 351 | 640 | 757 | 1 092 | 914 | 1 088 | 7 592 | 13 101 | 33735 | 0.12% | 0.81% |
| 1990 | 3 582 | 4 277 | 5 756 | 22 382 | 107 706 | 140 399 | 178 435 | 210 427 | 304 340 | 414 618 | 1391922 | 5.10% | 5.91% |
| 2000 | 526 972 | 546 669 | 611 208 | 586 772 | 658 652 | 698 569 | 785 693 | 876 363 | 974 611 | 1 029 259 | 7294768 | 26.71% | 32.62% |
| 2010 | 975 753 | 955 226 | 999 458 | 1 045 968 | 1 040 581 | 1 037 259 | 1 156 116 | 1 175 824 | 1 306 272 | 1 326 487 | 11018944 | 40.35% | 72.97% |
| 2020 | 1 510 562 | 1 634 990 | 1 591 944 | 1 405 671 | 1 239 393 | 7382560 | 27.03% | 100.00% |