| Year | Value | | 2022 | 23,454,198 | | 2021 | 22,842,482 | | 2020 | 22,231,053 | | 2019 | 21,624,451 | | 2018 | 21,005,857 | | 2017 | 20,344,125 | | 2016 | 19,690,357 | | 2015 | 19,084,493 | | 2014 | 18,496,684 | | 2013 | 17,985,615 | | 2012 | 17,566,190 | | 2011 | 17,193,271 | | 2010 | 16,851,113 | | 2009 | 16,452,670 | | 2008 | 16,007,627 | | 2007 | 15,566,424 | | 2006 | 15,133,106 | | 2005 | 14,728,917 | | 2004 | 14,362,444 | | 2003 | 14,031,002 | | 2002 | 13,714,630 | | 2001 | 13,397,021 | | 2000 | 13,066,984 | | 1999 | 12,728,827 | | 1998 | 12,410,574 | | 1997 | 12,103,541 | | 1996 | 11,793,467 | | 1995 | 11,493,994 | | 1994 | 11,192,341 | | 1993 | 10,908,603 | | 1992 | 10,704,351 | | 1991 | 10,545,481 | | 1990 | 10,372,354 | | 1989 | 10,193,049 | | 1988 | 10,048,781 | | 1987 | 9,918,516 | | 1986 | 9,749,846 | | 1985 | 9,576,076 | | 1984 | 9,409,814 | | 1983 | 9,190,704 | | 1982 | 8,886,923 | | 1981 | 8,542,680 | | 1980 | 8,200,719 | | 1979 | 7,874,230 | | 1978 | 7,564,023 | | 1977 | 7,267,038 | | 1976 | 6,985,965 | | 1975 | 6,719,464 | | 1974 | 6,463,611 | | 1973 | 6,231,936 | | 1972 | 6,025,491 | | 1971 | 5,829,405 | | 1970 | 5,644,479 | | 1969 | 5,471,026 | | 1968 | 5,303,824 | | 1967 | 5,141,408 | | 1966 | 4,985,118 | | 1965 | 4,831,577 | | 1964 | 4,677,168 | | 1963 | 4,529,837 | | 1962 | 4,392,323 | | 1961 | 4,261,491 | | 1960 | 4,137,077 |
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