| Year | Value | | 2022 | 16,780,756 | | 2021 | 16,457,496 | | 2020 | 16,129,086 | | 2019 | 15,798,612 | | 2018 | 15,472,613 | | 2017 | 15,148,680 | | 2016 | 14,814,792 | | 2015 | 14,473,575 | | 2014 | 14,136,988 | | 2013 | 13,802,693 | | 2012 | 13,470,314 | | 2011 | 13,145,044 | | 2010 | 12,831,981 | | 2009 | 12,522,583 | | 2008 | 12,212,794 | | 2007 | 11,906,554 | | 2006 | 11,604,406 | | 2005 | 11,306,552 | | 2004 | 11,014,041 | | 2003 | 10,728,320 | | 2002 | 10,445,597 | | 2001 | 10,167,572 | | 2000 | 9,905,777 | | 1999 | 9,662,884 | | 1998 | 9,431,876 | | 1997 | 9,208,514 | | 1996 | 8,995,002 | | 1995 | 8,789,218 | | 1994 | 8,586,206 | | 1993 | 8,387,013 | | 1992 | 8,188,676 | | 1991 | 7,991,633 | | 1990 | 7,795,067 | | 1989 | 7,598,834 | | 1988 | 7,408,850 | | 1987 | 7,228,470 | | 1986 | 7,058,574 | | 1985 | 6,897,669 | | 1984 | 6,742,363 | | 1983 | 6,553,893 | | 1982 | 6,339,741 | | 1981 | 6,144,992 | | 1980 | 5,963,727 | | 1979 | 5,779,312 | | 1978 | 5,593,203 | | 1977 | 5,415,337 | | 1976 | 5,254,551 | | 1975 | 5,106,573 | | 1974 | 4,959,824 | | 1973 | 4,816,752 | | 1972 | 4,679,479 | | 1971 | 4,551,655 | | 1970 | 4,427,324 | | 1969 | 4,306,249 | | 1968 | 4,193,923 | | 1967 | 4,085,702 | | 1966 | 3,980,020 | | 1965 | 3,876,381 | | 1964 | 3,774,468 | | 1963 | 3,675,079 | | 1962 | 3,578,109 | | 1961 | 3,483,445 | | 1960 | 3,378,749 |
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