| Year | Value | | 2022 | 18,749,086 | | 2021 | 18,218,652 | | 2020 | 17,673,931 | | 2019 | 17,149,385 | | 2018 | 16,628,698 | | 2017 | 16,128,269 | | 2016 | 15,646,478 | | 2015 | 15,085,945 | | 2014 | 14,471,075 | | 2013 | 13,905,910 | | 2012 | 13,373,825 | | 2011 | 12,859,613 | | 2010 | 12,352,956 | | 2009 | 11,880,646 | | 2008 | 11,468,410 | | 2007 | 11,086,590 | | 2006 | 10,699,139 | | 2005 | 10,311,676 | | 2004 | 9,929,025 | | 2003 | 9,539,895 | | 2002 | 9,173,616 | | 2001 | 8,846,500 | | 2000 | 8,542,632 | | 1999 | 8,251,380 | | 1998 | 7,976,131 | | 1997 | 7,722,086 | | 1996 | 7,463,871 | | 1995 | 7,188,205 | | 1994 | 6,924,518 | | 1993 | 6,677,046 | | 1992 | 6,393,200 | | 1991 | 6,058,564 | | 1990 | 5,728,164 | | 1989 | 5,371,319 | | 1988 | 5,052,427 | | 1987 | 4,767,917 | | 1986 | 4,512,917 | | 1985 | 4,304,243 | | 1984 | 4,148,212 | | 1983 | 4,039,343 | | 1982 | 3,969,994 | | 1981 | 3,900,940 | | 1980 | 3,836,151 | | 1979 | 3,794,823 | | 1978 | 3,760,487 | | 1977 | 3,720,416 | | 1976 | 3,659,798 | | 1975 | 3,593,691 | | 1974 | 3,525,952 | | 1973 | 3,448,109 | | 1972 | 3,364,783 | | 1971 | 3,285,360 | | 1970 | 3,211,144 | | 1969 | 3,139,383 | | 1968 | 3,070,482 | | 1967 | 3,003,135 | | 1966 | 2,929,416 | | 1965 | 2,847,607 | | 1964 | 2,757,687 | | 1963 | 2,663,215 | | 1962 | 2,569,037 | | 1961 | 2,483,019 | | 1960 | 2,411,189 |
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