Year | Value | 2022 | 35,733,916 | 2021 | 35,461,520 | 2020 | 35,109,278 | 2019 | 34,529,827 | 2018 | 34,292,608 | 2017 | 34,244,264 | 2016 | 33,799,720 | 2015 | 32,702,809 | 2014 | 31,476,028 | 2013 | 30,250,967 | 2012 | 28,889,697 | 2011 | 27,741,533 | 2010 | 27,369,752 | 2009 | 27,200,420 | 2008 | 26,785,960 | 2007 | 26,398,830 | 2006 | 26,126,471 | 2005 | 25,807,853 | 2004 | 25,472,297 | 2003 | 25,166,450 | 2002 | 24,892,391 | 2001 | 24,661,789 | 2000 | 24,483,209 | 1999 | 24,422,764 | 1998 | 24,419,686 | 1997 | 24,400,968 | 1996 | 24,378,033 | 1995 | 24,292,675 | 1994 | 24,106,290 | 1993 | 24,055,703 | 1992 | 24,055,691 | 1991 | 23,900,082 | 1990 | 23,749,299 | 1989 | 23,396,653 | 1988 | 22,356,768 | 1987 | 21,023,947 | 1986 | 19,883,517 | 1985 | 18,920,556 | 1984 | 18,562,788 | 1983 | 19,046,820 | 1982 | 19,894,414 | 1981 | 20,628,244 | 1980 | 21,088,943 | 1979 | 21,201,470 | 1978 | 21,034,858 | 1977 | 20,748,912 | 1976 | 20,359,337 | 1975 | 19,941,905 | 1974 | 19,498,472 | 1973 | 19,016,303 | 1972 | 18,600,458 | 1971 | 18,273,069 | 1970 | 17,943,919 | 1969 | 17,621,626 | 1968 | 17,319,299 | 1967 | 16,976,594 | 1966 | 16,587,563 | 1965 | 16,230,215 | 1964 | 15,890,759 | 1963 | 15,532,250 | 1962 | 15,117,184 | 1961 | 14,717,279 | 1960 | 14,346,033 |
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