Year | Value | 2022 | 61,398,066 | 2021 | 63,570,333 | 2020 | 63,199,273 | 2019 | 61,027,670 | 2018 | 58,757,994 | 2017 | 56,787,448 | 2016 | 55,090,114 | 2015 | 53,575,308 | 2014 | 52,431,972 | 2013 | 51,422,918 | 2012 | 49,776,004 | 2011 | 48,260,387 | 2010 | 48,026,824 | 2009 | 49,028,021 | 2008 | 51,445,743 | 2007 | 54,696,108 | 2006 | 57,979,607 | 2005 | 61,231,308 | 2004 | 63,824,061 | 2003 | 65,356,247 | 2002 | 65,505,826 | 2001 | 64,681,180 | 2000 | 63,779,971 | 1999 | 62,792,576 | 1998 | 62,428,425 | 1997 | 62,091,122 | 1996 | 58,799,803 | 1995 | 53,106,911 | 1994 | 47,596,670 | 1993 | 42,380,321 | 1992 | 39,373,940 | 1991 | 40,119,882 | 1990 | 42,707,389 | 1989 | 45,279,883 | 1988 | 46,618,134 | 1987 | 46,463,982 | 1986 | 45,703,852 | 1985 | 44,495,143 | 1984 | 42,652,654 | 1983 | 40,531,746 | 1982 | 38,082,434 | 1981 | 35,657,836 | 1980 | 33,471,511 | 1979 | 31,403,793 | 1978 | 29,680,958 | 1977 | 28,203,323 | 1976 | 27,212,531 | 1975 | 26,654,348 | 1974 | 26,271,508 | 1973 | 26,079,830 | 1972 | 26,092,268 | 1971 | 26,029,745 | 1970 | 25,904,195 | 1969 | 25,926,246 | 1968 | 25,977,914 | 1967 | 25,763,324 | 1966 | 25,267,745 | 1965 | 24,733,871 | 1964 | 24,290,922 | 1963 | 23,818,542 | 1962 | 23,338,208 | 1961 | 22,993,826 | 1960 | 22,849,648 |
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