Year | Value | 2022 | 23,101,700 | 2021 | 22,830,924 | 2020 | 21,958,936 | 2019 | 20,647,864 | 2018 | 19,369,262 | 2017 | 18,266,397 | 2016 | 17,610,160 | 2015 | 17,804,133 | 2014 | 18,570,758 | 2013 | 19,431,023 | 2012 | 20,273,388 | 2011 | 20,730,484 | 2010 | 20,694,418 | 2009 | 20,231,710 | 2008 | 19,520,913 | 2007 | 18,854,835 | 2006 | 18,439,849 | 2005 | 18,365,599 | 2004 | 18,586,392 | 2003 | 19,010,012 | 2002 | 19,363,230 | 2001 | 19,539,360 | 2000 | 19,568,313 | 1999 | 19,456,422 | 1998 | 19,258,653 | 1997 | 18,962,757 | 1996 | 18,593,371 | 1995 | 18,121,856 | 1994 | 17,421,059 | 1993 | 16,372,061 | 1992 | 15,136,681 | 1991 | 13,994,537 | 1990 | 13,220,115 | 1989 | 13,216,787 | 1988 | 13,927,720 | 1987 | 15,035,179 | 1986 | 16,166,690 | 1985 | 16,933,610 | 1984 | 17,165,109 | 1983 | 17,048,417 | 1982 | 16,813,724 | 1981 | 16,527,564 | 1980 | 16,261,391 | 1979 | 15,954,037 | 1978 | 15,636,085 | 1977 | 15,324,959 | 1976 | 15,031,324 | 1975 | 14,744,716 | 1974 | 14,397,894 | 1973 | 13,953,693 | 1972 | 13,484,840 | 1971 | 13,020,549 | 1970 | 12,565,888 | 1969 | 12,179,447 | 1968 | 11,865,508 | 1967 | 11,554,938 | 1966 | 11,210,949 | 1965 | 10,873,354 | 1964 | 10,569,801 | 1963 | 10,375,463 | 1962 | 10,225,935 | 1961 | 10,038,602 | 1960 | 9,855,497 |
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