| Year | Value | | 2022 | 16,901,375 | | 2021 | 16,744,368 | | 2020 | 16,635,149 | | 2019 | 16,461,536 | | 2018 | 16,183,951 | | 2017 | 15,872,735 | | 2016 | 15,554,011 | | 2015 | 15,255,818 | | 2014 | 14,972,389 | | 2013 | 14,652,595 | | 2012 | 14,289,544 | | 2011 | 13,907,499 | | 2010 | 13,485,102 | | 2009 | 13,004,221 | | 2008 | 12,527,343 | | 2007 | 12,069,184 | | 2006 | 11,628,930 | | 2005 | 11,237,734 | | 2004 | 10,898,605 | | 2003 | 10,592,161 | | 2002 | 10,295,483 | | 2001 | 10,008,031 | | 2000 | 9,728,335 | | 1999 | 9,450,488 | | 1998 | 9,175,278 | | 1997 | 8,904,348 | | 1996 | 8,632,016 | | 1995 | 8,346,131 | | 1994 | 8,055,026 | | 1993 | 7,760,131 | | 1992 | 7,472,868 | | 1991 | 7,226,531 | | 1990 | 7,038,003 | | 1989 | 6,806,763 | | 1988 | 6,619,191 | | 1987 | 6,431,687 | | 1986 | 6,213,635 | | 1985 | 5,974,921 | | 1984 | 5,731,124 | | 1983 | 5,487,821 | | 1982 | 5,256,054 | | 1981 | 5,039,623 | | 1980 | 4,830,039 | | 1979 | 4,612,938 | | 1978 | 4,403,630 | | 1977 | 4,209,527 | | 1976 | 4,023,323 | | 1975 | 3,865,758 | | 1974 | 3,747,842 | | 1973 | 3,661,838 | | 1972 | 3,604,882 | | 1971 | 3,565,245 | | 1970 | 3,529,650 | | 1969 | 3,493,393 | | 1968 | 3,454,104 | | 1967 | 3,409,097 | | 1966 | 3,360,716 | | 1965 | 3,309,922 | | 1964 | 3,253,866 | | 1963 | 3,193,329 | | 1962 | 3,131,748 | | 1961 | 3,069,016 | | 1960 | 3,005,193 |
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