Year | Value | 2022 | 34,041,691 | 2021 | 33,771,699 | 2020 | 33,917,104 | 2019 | 34,020,315 | 2018 | 34,102,148 | 2017 | 34,197,756 | 2016 | 34,343,540 | 2015 | 34,486,415 | 2014 | 34,672,571 | 2013 | 34,942,187 | 2012 | 35,291,017 | 2011 | 35,703,382 | 2010 | 36,165,895 | 2009 | 36,483,207 | 2008 | 36,634,557 | 2007 | 36,613,157 | 2006 | 36,467,602 | 2005 | 36,290,302 | 2004 | 36,164,432 | 2003 | 36,114,808 | 2002 | 36,169,968 | 2001 | 36,340,887 | 2000 | 36,602,076 | 1999 | 36,849,762 | 1998 | 36,975,147 | 1997 | 36,972,158 | 1996 | 36,867,668 | 1995 | 36,748,020 | 1994 | 36,753,575 | 1993 | 36,911,202 | 1992 | 37,202,137 | 1991 | 37,662,897 | 1990 | 38,175,555 | 1989 | 38,579,929 | 1988 | 38,865,624 | 1987 | 39,121,245 | 1986 | 39,134,170 | 1985 | 39,086,258 | 1984 | 39,290,828 | 1983 | 39,573,524 | 1982 | 39,770,208 | 1981 | 40,010,504 | 1980 | 40,167,185 | 1979 | 40,043,703 | 1978 | 39,791,894 | 1977 | 39,519,726 | 1976 | 39,224,341 | 1975 | 38,899,931 | 1974 | 38,529,939 | 1973 | 38,120,364 | 1972 | 37,711,789 | 1971 | 37,489,782 | 1970 | 37,117,458 | 1969 | 36,643,563 | 1968 | 36,435,350 | 1967 | 36,465,989 | 1966 | 36,063,648 | 1965 | 35,018,608 | 1964 | 33,917,836 | 1963 | 32,804,638 | 1962 | 31,485,210 | 1961 | 30,346,098 | 1960 | 29,957,991 |
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