| Year | Value | | 2022 | 22,970,106 | | 2021 | 22,247,478 | | 2020 | 21,543,775 | | 2019 | 20,821,040 | | 2018 | 20,093,924 | | 2017 | 19,406,882 | | 2016 | 18,763,628 | | 2015 | 18,178,364 | | 2014 | 17,667,283 | | 2013 | 17,195,819 | | 2012 | 16,717,523 | | 2011 | 16,180,916 | | 2010 | 15,633,494 | | 2009 | 15,119,557 | | 2008 | 14,651,290 | | 2007 | 14,256,354 | | 2006 | 13,883,514 | | 2005 | 13,520,486 | | 2004 | 13,205,545 | | 2003 | 12,903,167 | | 2002 | 12,566,852 | | 2001 | 12,215,704 | | 2000 | 11,885,881 | | 1999 | 11,552,536 | | 1998 | 11,206,566 | | 1997 | 10,877,846 | | 1996 | 10,573,046 | | 1995 | 10,277,246 | | 1994 | 9,962,740 | | 1993 | 9,665,349 | | 1992 | 9,384,221 | | 1991 | 9,097,753 | | 1990 | 8,844,699 | | 1989 | 8,599,929 | | 1988 | 8,334,408 | | 1987 | 8,063,909 | | 1986 | 7,808,241 | | 1985 | 7,589,887 | | 1984 | 7,391,846 | | 1983 | 7,209,215 | | 1982 | 7,069,989 | | 1981 | 6,990,045 | | 1980 | 6,927,554 | | 1979 | 6,819,229 | | 1978 | 6,667,375 | | 1977 | 6,506,995 | | 1976 | 6,355,479 | | 1975 | 6,209,746 | | 1974 | 6,075,619 | | 1973 | 5,956,801 | | 1972 | 5,855,920 | | 1971 | 5,756,202 | | 1970 | 5,642,193 | | 1969 | 5,519,716 | | 1968 | 5,392,222 | | 1967 | 5,259,900 | | 1966 | 5,132,548 | | 1965 | 5,015,253 | | 1964 | 4,903,898 | | 1963 | 4,794,959 | | 1962 | 4,689,422 | | 1961 | 4,586,516 | | 1960 | 4,486,525 |
|