Table 6.
Year | Number of Publications | Cumulative Total | W1 | W2 | Relative Growth Rate | Doubling Time |
---|---|---|---|---|---|---|
1938 | 13 | 13 | – | 2.57 | – | – |
1939 | 10 | 23 | 2.57 | 3.14 | 0.57 | 1.21 |
1940 | 12 | 35 | 3.14 | 3.56 | 0.42 | 1.65 |
1941 | 14 | 49 | 3.56 | 3.89 | 0.34 | 2.06 |
1942 | 12 | 61 | 3.89 | 4.11 | 0.22 | 3.16 |
1943 | 16 | 77 | 4.11 | 4.34 | 0.23 | 2.97 |
1944 | 12 | 89 | 4.34 | 4.49 | 0.14 | 4.78 |
1945 | 52 | 141 | 4.49 | 4.95 | 0.46 | 1.51 |
1946 | 134 | 275 | 4.95 | 5.62 | 0.67 | 1.04 |
1947 | 162 | 437 | 5.62 | 6.08 | 0.46 | 1.50 |
1948 | 125 | 562 | 6.08 | 6.33 | 0.25 | 2.75 |
1949 | 93 | 655 | 6.33 | 6.49 | 0.15 | 4.52 |
1950 | 170 | 825 | 6.49 | 6.72 | 0.23 | 3.00 |
1951 | 153 | 978 | 6.72 | 6.89 | 0.17 | 4.07 |
1952 | 167 | 1145 | 6.89 | 7.04 | 0.16 | 4.40 |
1953 | 164 | 1309 | 7.04 | 7.18 | 0.13 | 5.18 |
1954 | 132 | 1441 | 7.18 | 7.27 | 0.10 | 7.21 |
1955 | 142 | 1583 | 7.27 | 7.37 | 0.09 | 7.37 |
1956 | 159 | 1742 | 7.37 | 7.46 | 0.10 | 7.24 |
1957 | 181 | 1923 | 7.46 | 7.56 | 0.10 | 7.01 |
1958 | 180 | 2103 | 7.56 | 7.65 | 0.09 | 7.74 |
1959 | 190 | 2293 | 7.65 | 7.74 | 0.09 | 8.01 |
1960 | 197 | 2490 | 7.74 | 7.82 | 0.08 | 8.41 |
1961 | 248 | 2738 | 7.82 | 7.92 | 0.09 | 7.30 |
1962 | 274 | 3012 | 7.92 | 8.01 | 0.10 | 7.27 |
1963 | 251 | 3263 | 8.01 | 8.09 | 0.08 | 8.66 |
1964 | 279 | 3542 | 8.09 | 8.17 | 0.08 | 8.45 |
1965 | 286 | 3828 | 8.17 | 8.25 | 0.08 | 8.92 |
1966 | 263 | 4091 | 8.25 | 8.32 | 0.07 | 10.43 |
1967 | 310 | 4401 | 8.32 | 8.39 | 0.07 | 9.49 |
1968 | 369 | 4770 | 8.39 | 8.47 | 0.08 | 8.61 |
1969 | 284 | 5054 | 8.47 | 8.53 | 0.06 | 11.98 |
1970 | 340 | 5394 | 8.53 | 8.59 | 0.07 | 10.64 |
1971 | 423 | 5817 | 8.59 | 8.67 | 0.08 | 9.18 |
1972 | 362 | 6179 | 8.67 | 8.73 | 0.06 | 11.48 |
1973 | 408 | 6587 | 8.73 | 8.79 | 0.06 | 10.84 |
1974 | 469 | 7056 | 8.79 | 8.86 | 0.07 | 10.07 |
1975 | 576 | 7632 | 8.86 | 8.94 | 0.08 | 8.83 |
1976 | 520 | 8152 | 8.94 | 9.01 | 0.07 | 10.51 |
1977 | 492 | 8644 | 9.01 | 9.07 | 0.06 | 11.82 |
1978 | 408 | 9052 | 9.07 | 9.11 | 0.05 | 15.02 |
1979 | 734 | 9786 | 9.11 | 9.19 | 0.08 | 8.89 |
1980 | 591 | 10377 | 9.19 | 9.25 | 0.06 | 11.82 |
1981 | 776 | 11153 | 9.25 | 9.32 | 0.07 | 9.61 |
1982 | 785 | 11938 | 9.32 | 9.39 | 0.07 | 10.19 |
1983 | 746 | 12684 | 9.39 | 9.45 | 0.06 | 11.43 |
1984 | 727 | 13411 | 9.45 | 9.50 | 0.06 | 12.43 |
1985 | 774 | 14185 | 9.50 | 9.56 | 0.06 | 12.35 |
1986 | 870 | 15055 | 9.56 | 9.62 | 0.06 | 11.64 |
1987 | 923 | 15978 | 9.62 | 9.68 | 0.06 | 11.65 |
1988 | 846 | 16824 | 9.68 | 9.73 | 0.05 | 13.43 |
1989 | 1060 | 17884 | 9.73 | 9.79 | 0.06 | 11.34 |
1990 | 1628 | 19512 | 9.79 | 9.88 | 0.09 | 7.95 |
1991 | 1544 | 21056 | 9.88 | 9.96 | 0.08 | 9.10 |
1992 | 1545 | 22601 | 9.96 | 10.03 | 0.07 | 9.79 |
1993 | 1720 | 24321 | 10.03 | 10.10 | 0.07 | 9.45 |
1994 | 1475 | 25796 | 10.10 | 10.16 | 0.06 | 11.77 |
1995 | 1865 | 27661 | 10.16 | 10.23 | 0.07 | 9.93 |
1996 | 1800 | 29461 | 10.23 | 10.29 | 0.06 | 10.99 |
1997 | 1877 | 31338 | 10.29 | 10.35 | 0.06 | 11.22 |
1998 | 1982 | 33320 | 10.35 | 10.41 | 0.06 | 11.30 |
1999 | 2089 | 35409 | 10.41 | 10.48 | 0.06 | 11.40 |
2000 | 2330 | 37739 | 10.48 | 10.54 | 0.06 | 10.87 |
2001 | 2499 | 40238 | 10.54 | 10.60 | 0.06 | 10.81 |
2002 | 2751 | 42989 | 10.60 | 10.67 | 0.07 | 10.48 |
2003 | 2802 | 45791 | 10.67 | 10.73 | 0.06 | 10.97 |
2004 | 3061 | 48852 | 10.73 | 10.80 | 0.06 | 10.71 |
2005 | 3908 | 52760 | 10.80 | 10.87 | 0.08 | 9.00 |
2006 | 4637 | 57397 | 10.87 | 10.96 | 0.08 | 8.23 |
2007 | 5310 | 62707 | 10.96 | 11.05 | 0.09 | 7.83 |
2008 | 6216 | 68923 | 11.05 | 11.14 | 0.09 | 7.33 |
2009 | 6582 | 75505 | 11.14 | 11.23 | 0.09 | 7.60 |
2010 | 7088 | 82593 | 11.23 | 11.32 | 0.09 | 7.72 |
2011 | 8691 | 91284 | 11.32 | 11.42 | 0.10 | 6.93 |
2012 | 8194 | 99478 | 11.42 | 11.51 | 0.09 | 8.06 |
2013 | 8920 | 108398 | 11.51 | 11.59 | 0.09 | 8.07 |
2014 | 8642 | 117040 | 11.59 | 11.67 | 0.08 | 9.03 |
2015 | 8825 | 125865 | 11.67 | 11.74 | 0.07 | 9.53 |
2016 | 8930 | 134795 | 11.74 | 11.81 | 0.07 | 10.11 |
2017 | 8471 | 143266 | 11.81 | 11.87 | 0.06 | 11.37 |
2018 | 8212 | 151478 | 11.87 | 11.93 | 0.06 | 12.43 |
2019 | 8471 | 159949 | 11.93 | 11.98 | 0.05 | 12.73 |
2020 | 9591 | 169540 | 11.98 | 12.04 | 0.06 | 11.90 |