| Year | Value | | 2022 | 19,708,440 | | 2021 | 19,370,847 | | 2020 | 18,942,792 | | 2019 | 18,348,825 | | 2018 | 17,533,492 | | 2017 | 16,539,263 | | 2016 | 15,536,669 | | 2015 | 14,559,984 | | 2014 | 13,621,620 | | 2013 | 12,911,921 | | 2012 | 12,455,817 | | 2011 | 12,074,425 | | 2010 | 11,747,094 | | 2009 | 11,474,571 | | 2008 | 11,249,615 | | 2007 | 11,052,798 | | 2006 | 10,855,366 | | 2005 | 10,638,809 | | 2004 | 10,403,264 | | 2003 | 10,149,912 | | 2002 | 9,887,737 | | 2001 | 9,641,342 | | 2000 | 9,423,233 | | 1999 | 9,222,571 | | 1998 | 9,030,039 | | 1997 | 8,842,417 | | 1996 | 8,650,784 | | 1995 | 8,450,563 | | 1994 | 8,243,377 | | 1993 | 8,029,878 | | 1992 | 7,813,753 | | 1991 | 7,604,623 | | 1990 | 7,408,501 | | 1989 | 7,225,325 | | 1988 | 7,056,144 | | 1987 | 6,899,760 | | 1986 | 6,749,422 | | 1985 | 6,601,490 | | 1984 | 6,456,544 | | 1983 | 6,312,732 | | 1982 | 6,171,880 | | 1981 | 6,042,243 | | 1980 | 5,926,583 | | 1979 | 5,821,503 | | 1978 | 5,727,978 | | 1977 | 5,638,912 | | 1976 | 5,534,350 | | 1975 | 5,404,995 | | 1974 | 5,256,247 | | 1973 | 5,088,445 | | 1972 | 4,911,918 | | 1971 | 4,755,205 | | 1970 | 4,634,619 | | 1969 | 4,545,194 | | 1968 | 4,487,259 | | 1967 | 4,450,444 | | 1966 | 4,393,835 | | 1965 | 4,287,977 | | 1964 | 4,131,649 | | 1963 | 3,923,302 | | 1962 | 3,686,819 | | 1961 | 3,474,871 | | 1960 | 3,324,587 |
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