| Year | Value | | 2022 | 16,320,537 | | 2021 | 15,993,524 | | 2020 | 15,669,666 | | 2019 | 15,354,608 | | 2018 | 15,052,184 | | 2017 | 14,751,101 | | 2016 | 14,452,704 | | 2015 | 14,154,937 | | 2014 | 13,855,753 | | 2013 | 13,555,422 | | 2012 | 13,265,331 | | 2011 | 13,025,785 | | 2010 | 12,839,771 | | 2009 | 12,679,810 | | 2008 | 12,550,347 | | 2007 | 12,450,568 | | 2006 | 12,330,490 | | 2005 | 12,224,753 | | 2004 | 12,160,881 | | 2003 | 12,075,828 | | 2002 | 11,984,644 | | 2001 | 11,910,978 | | 2000 | 11,834,676 | | 1999 | 11,716,454 | | 1998 | 11,548,364 | | 1997 | 11,362,401 | | 1996 | 11,178,171 | | 1995 | 10,994,041 | | 1994 | 10,858,594 | | 1993 | 10,794,918 | | 1992 | 10,641,501 | | 1991 | 10,377,815 | | 1990 | 10,113,893 | | 1989 | 9,846,346 | | 1988 | 9,568,739 | | 1987 | 9,277,488 | | 1986 | 8,983,044 | | 1985 | 8,690,515 | | 1984 | 8,398,567 | | 1983 | 8,106,356 | | 1982 | 7,803,855 | | 1981 | 7,506,526 | | 1980 | 7,049,926 | | 1979 | 6,655,833 | | 1978 | 6,549,349 | | 1977 | 6,453,044 | | 1976 | 6,288,387 | | 1975 | 6,097,083 | | 1974 | 5,903,530 | | 1973 | 5,712,712 | | 1972 | 5,532,842 | | 1971 | 5,363,423 | | 1970 | 5,202,918 | | 1969 | 5,044,163 | | 1968 | 4,886,347 | | 1967 | 4,734,694 | | 1966 | 4,588,529 | | 1965 | 4,447,149 | | 1964 | 4,310,332 | | 1963 | 4,177,931 | | 1962 | 4,049,778 | | 1961 | 3,925,952 | | 1960 | 3,806,310 |
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