| Year | Value | | 2022 | 35,588,987 | | 2021 | 34,503,774 | | 2020 | 33,428,486 | | 2019 | 32,353,588 | | 2018 | 31,273,533 | | 2017 | 30,208,628 | | 2016 | 29,154,746 | | 2015 | 28,127,721 | | 2014 | 27,128,337 | | 2013 | 26,147,002 | | 2012 | 25,188,292 | | 2011 | 24,259,111 | | 2010 | 23,364,185 | | 2009 | 22,507,674 | | 2008 | 21,691,522 | | 2007 | 20,909,684 | | 2006 | 20,162,340 | | 2005 | 19,450,959 | | 2004 | 18,771,125 | | 2003 | 18,124,342 | | 2002 | 17,516,139 | | 2001 | 16,941,587 | | 2000 | 16,394,062 | | 1999 | 15,870,753 | | 1998 | 15,366,864 | | 1997 | 14,871,146 | | 1996 | 14,383,350 | | 1995 | 13,912,253 | | 1994 | 13,462,031 | | 1993 | 13,038,270 | | 1992 | 12,632,507 | | 1991 | 12,228,691 | | 1990 | 11,828,638 | | 1989 | 11,439,498 | | 1988 | 11,060,261 | | 1987 | 10,694,057 | | 1986 | 10,332,574 | | 1985 | 9,970,621 | | 1984 | 9,617,702 | | 1983 | 9,276,707 | | 1982 | 8,947,152 | | 1981 | 8,631,457 | | 1980 | 8,330,047 | | 1979 | 8,043,218 | | 1978 | 7,771,590 | | 1977 | 7,511,895 | | 1976 | 7,266,780 | | 1975 | 7,032,713 | | 1974 | 6,802,494 | | 1973 | 6,578,230 | | 1972 | 6,364,731 | | 1971 | 6,177,049 | | 1970 | 6,029,700 | | 1969 | 5,928,386 | | 1968 | 5,868,203 | | 1967 | 5,827,503 | | 1966 | 5,787,044 | | 1965 | 5,736,582 | | 1964 | 5,673,199 | | 1963 | 5,599,827 | | 1962 | 5,521,400 | | 1961 | 5,441,333 | | 1960 | 5,357,195 |
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