Year | Value | 2022 | 23,624,648 | 2021 | 22,742,962 | 2020 | 22,556,238 | 2019 | 22,525,057 | 2018 | 22,287,720 | 2017 | 22,033,895 | 2016 | 21,798,179 | 2015 | 21,461,226 | 2014 | 21,073,361 | 2013 | 20,672,121 | 2012 | 20,277,910 | 2011 | 19,951,588 | 2010 | 19,759,931 | 2009 | 19,667,499 | 2008 | 19,655,252 | 2007 | 19,626,221 | 2006 | 19,584,871 | 2005 | 19,480,142 | 2004 | 19,274,109 | 2003 | 19,162,175 | 2002 | 19,072,065 | 2001 | 18,838,671 | 2000 | 18,611,965 | 1999 | 18,235,107 | 1998 | 17,386,547 | 1997 | 16,322,656 | 1996 | 15,363,998 | 1995 | 14,540,963 | 1994 | 14,208,798 | 1993 | 14,515,393 | 1992 | 15,107,618 | 1991 | 15,637,508 | 1990 | 15,932,804 | 1989 | 15,929,111 | 1988 | 15,709,212 | 1987 | 15,393,442 | 1986 | 15,004,020 | 1985 | 14,628,139 | 1984 | 14,244,492 | 1983 | 13,837,246 | 1982 | 13,482,881 | 1981 | 13,185,576 | 1980 | 12,876,057 | 1979 | 12,554,214 | 1978 | 12,230,051 | 1977 | 11,853,032 | 1976 | 11,471,611 | 1975 | 11,135,994 | 1974 | 10,810,372 | 1973 | 10,494,506 | 1972 | 10,174,580 | 1971 | 9,862,045 | 1970 | 9,575,421 | 1969 | 9,354,981 | 1968 | 9,181,834 | 1967 | 9,020,042 | 1966 | 8,814,088 | 1965 | 8,590,183 | 1964 | 8,365,180 | 1963 | 8,103,344 | 1962 | 7,852,609 | 1961 | 7,626,982 | 1960 | 7,396,516 |
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