| Year | Value | | 2022 | 16,596,389 | | 2021 | 16,407,343 | | 2020 | 16,213,821 | | 2019 | 16,009,996 | | 2018 | 15,801,948 | | 2017 | 15,584,594 | | 2016 | 15,354,558 | | 2015 | 15,120,922 | | 2014 | 14,885,695 | | 2013 | 14,646,296 | | 2012 | 14,405,218 | | 2011 | 14,163,015 | | 2010 | 13,925,419 | | 2009 | 13,686,532 | | 2008 | 13,437,576 | | 2007 | 13,179,771 | | 2006 | 12,916,424 | | 2005 | 12,651,740 | | 2004 | 12,385,554 | | 2003 | 12,118,281 | | 2002 | 11,850,120 | | 2001 | 11,581,251 | | 2000 | 11,313,791 | | 1999 | 11,042,420 | | 1998 | 10,765,935 | | 1997 | 10,488,071 | | 1996 | 10,211,073 | | 1995 | 9,938,199 | | 1994 | 9,667,337 | | 1993 | 9,401,203 | | 1992 | 9,142,411 | | 1991 | 8,890,521 | | 1990 | 8,642,988 | | 1989 | 8,396,840 | | 1988 | 8,151,106 | | 1987 | 7,907,269 | | 1986 | 7,671,909 | | 1985 | 7,448,452 | | 1984 | 7,239,367 | | 1983 | 7,044,106 | | 1982 | 6,859,613 | | 1981 | 6,682,667 | | 1980 | 6,509,322 | | 1979 | 6,339,986 | | 1978 | 6,175,335 | | 1977 | 6,013,614 | | 1976 | 5,860,256 | | 1975 | 5,715,521 | | 1974 | 5,575,364 | | 1973 | 5,440,270 | | 1972 | 5,310,789 | | 1971 | 5,187,194 | | 1970 | 5,065,072 | | 1969 | 4,943,494 | | 1968 | 4,824,059 | | 1967 | 4,705,207 | | 1966 | 4,585,060 | | 1965 | 4,461,131 | | 1964 | 4,334,252 | | 1963 | 4,206,691 | | 1962 | 4,079,794 | | 1961 | 3,955,530 | | 1960 | 3,835,196 |
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