| Year | Value | | 2022 | 17,801,970 | | 2021 | 17,578,693 | | 2020 | 17,348,887 | | 2019 | 17,108,814 | | 2018 | 16,862,044 | | 2017 | 16,611,902 | | 2016 | 16,357,965 | | 2015 | 16,105,131 | | 2014 | 15,853,231 | | 2013 | 15,596,906 | | 2012 | 15,335,247 | | 2011 | 15,067,128 | | 2010 | 14,790,589 | | 2009 | 14,507,231 | | 2008 | 14,222,078 | | 2007 | 13,938,903 | | 2006 | 13,656,474 | | 2005 | 13,377,395 | | 2004 | 13,102,048 | | 2003 | 12,772,847 | | 2002 | 12,450,597 | | 2001 | 12,132,721 | | 2000 | 11,818,373 | | 1999 | 11,506,670 | | 1998 | 11,196,321 | | 1997 | 10,888,948 | | 1996 | 10,586,612 | | 1995 | 10,291,455 | | 1994 | 10,005,073 | | 1993 | 9,732,395 | | 1992 | 9,507,775 | | 1991 | 9,291,826 | | 1990 | 9,082,470 | | 1989 | 8,880,862 | | 1988 | 8,686,718 | | 1987 | 8,499,066 | | 1986 | 8,318,057 | | 1985 | 8,142,119 | | 1984 | 7,968,548 | | 1983 | 7,797,622 | | 1982 | 7,627,841 | | 1981 | 7,459,026 | | 1980 | 7,290,604 | | 1979 | 7,121,766 | | 1978 | 6,953,460 | | 1977 | 6,786,889 | | 1976 | 6,622,304 | | 1975 | 6,459,734 | | 1974 | 6,303,040 | | 1973 | 6,148,402 | | 1972 | 5,995,965 | | 1971 | 5,846,812 | | 1970 | 5,703,546 | | 1969 | 5,563,340 | | 1968 | 5,429,650 | | 1967 | 5,302,077 | | 1966 | 5,179,740 | | 1965 | 5,064,891 | | 1964 | 4,953,633 | | 1963 | 4,844,953 | | 1962 | 4,738,864 | | 1961 | 4,635,063 | | 1960 | 4,533,437 |
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