| Year | Value | | 2022 | 22,673,762 | | 2021 | 22,100,683 | | 2020 | 21,522,626 | | 2019 | 20,951,639 | | 2018 | 20,392,723 | | 2017 | 19,835,858 | | 2016 | 19,275,498 | | 2015 | 18,718,019 | | 2014 | 18,169,842 | | 2013 | 17,636,408 | | 2012 | 17,113,732 | | 2011 | 16,602,651 | | 2010 | 16,116,845 | | 2009 | 15,650,022 | | 2008 | 15,197,915 | | 2007 | 14,757,074 | | 2006 | 14,316,242 | | 2005 | 13,876,127 | | 2004 | 13,445,977 | | 2003 | 13,030,591 | | 2002 | 12,632,269 | | 2001 | 12,249,764 | | 2000 | 11,882,888 | | 1999 | 11,533,554 | | 1998 | 11,201,063 | | 1997 | 10,897,353 | | 1996 | 10,621,210 | | 1995 | 10,353,263 | | 1994 | 10,091,256 | | 1993 | 9,840,075 | | 1992 | 9,598,555 | | 1991 | 9,365,064 | | 1990 | 9,131,361 | | 1989 | 8,895,234 | | 1988 | 8,663,720 | | 1987 | 8,434,996 | | 1986 | 8,207,827 | | 1985 | 7,979,185 | | 1984 | 7,751,476 | | 1983 | 7,531,184 | | 1982 | 7,321,817 | | 1981 | 7,123,730 | | 1980 | 6,932,967 | | 1979 | 6,749,939 | | 1978 | 6,577,779 | | 1977 | 6,416,569 | | 1976 | 6,269,765 | | 1975 | 6,138,444 | | 1974 | 6,018,141 | | 1973 | 5,907,742 | | 1972 | 5,805,283 | | 1971 | 5,707,793 | | 1970 | 5,611,666 | | 1969 | 5,515,747 | | 1968 | 5,422,119 | | 1967 | 5,330,613 | | 1966 | 5,242,797 | | 1965 | 5,157,929 | | 1964 | 5,076,111 | | 1963 | 4,998,671 | | 1962 | 4,924,497 | | 1961 | 4,852,833 | | 1960 | 4,783,259 |
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