| Year | Value | | 2022 | 23,401,332 | | 2021 | 22,700,638 | | 2020 | 21,973,090 | | 2019 | 21,241,606 | | 2018 | 20,521,108 | | 2017 | 19,823,359 | | 2016 | 19,131,236 | | 2015 | 18,493,558 | | 2014 | 17,920,438 | | 2013 | 17,387,215 | | 2012 | 16,886,179 | | 2011 | 16,395,857 | | 2010 | 15,916,868 | | 2009 | 15,450,462 | | 2008 | 14,997,204 | | 2007 | 14,555,146 | | 2006 | 14,125,371 | | 2005 | 13,710,476 | | 2004 | 13,308,219 | | 2003 | 12,911,462 | | 2002 | 12,507,523 | | 2001 | 12,118,958 | | 2000 | 11,750,782 | | 1999 | 11,383,926 | | 1998 | 11,017,324 | | 1997 | 10,690,916 | | 1996 | 10,381,224 | | 1995 | 10,100,846 | | 1994 | 9,826,618 | | 1993 | 9,498,976 | | 1992 | 9,172,087 | | 1991 | 8,861,681 | | 1990 | 8,574,406 | | 1989 | 8,301,682 | | 1988 | 8,039,233 | | 1987 | 7,789,133 | | 1986 | 7,555,813 | | 1985 | 7,345,132 | | 1984 | 7,149,198 | | 1983 | 6,970,613 | | 1982 | 6,812,345 | | 1981 | 6,669,155 | | 1980 | 6,543,396 | | 1979 | 6,419,221 | | 1978 | 6,274,451 | | 1977 | 6,116,945 | | 1976 | 5,962,577 | | 1975 | 5,812,948 | | 1974 | 5,669,989 | | 1973 | 5,536,784 | | 1972 | 5,414,597 | | 1971 | 5,288,827 | | 1970 | 5,146,530 | | 1969 | 4,996,815 | | 1968 | 4,847,172 | | 1967 | 4,700,990 | | 1966 | 4,561,931 | | 1965 | 4,429,334 | | 1964 | 4,302,192 | | 1963 | 4,180,144 | | 1962 | 4,063,899 | | 1961 | 3,953,611 | | 1960 | 3,848,251 |
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