Year | Value | 2022 | 38,892,258 | 2021 | 39,172,265 | 2020 | 39,390,132 | 2019 | 39,148,048 | 2018 | 38,800,763 | 2017 | 38,396,631 | 2016 | 37,937,020 | 2015 | 37,392,391 | 2014 | 36,855,661 | 2013 | 36,316,366 | 2012 | 35,784,615 | 2011 | 35,453,621 | 2010 | 35,175,179 | 2009 | 34,770,966 | 2008 | 34,637,100 | 2007 | 34,680,494 | 2006 | 34,291,284 | 2005 | 33,203,146 | 2004 | 31,943,773 | 2003 | 30,680,064 | 2002 | 29,317,766 | 2001 | 28,247,772 | 2000 | 28,010,250 | 1999 | 28,054,551 | 1998 | 27,874,079 | 1997 | 27,708,190 | 1996 | 27,554,367 | 1995 | 27,254,073 | 1994 | 26,840,437 | 1993 | 26,358,880 | 1992 | 25,896,874 | 1991 | 25,572,098 | 1990 | 25,425,318 | 1989 | 25,524,925 | 1988 | 25,751,708 | 1987 | 25,954,781 | 1986 | 26,124,132 | 1985 | 26,192,508 | 1984 | 26,104,231 | 1983 | 26,139,400 | 1982 | 26,186,070 | 1981 | 26,025,568 | 1980 | 25,883,650 | 1979 | 25,511,937 | 1978 | 24,397,279 | 1977 | 22,936,266 | 1976 | 21,670,533 | 1975 | 20,647,725 | 1974 | 20,301,690 | 1973 | 20,829,782 | 1972 | 21,765,661 | 1971 | 22,673,437 | 1970 | 23,249,152 | 1969 | 23,422,235 | 1968 | 23,288,482 | 1967 | 23,028,917 | 1966 | 22,651,490 | 1965 | 22,220,633 | 1964 | 21,752,292 | 1963 | 21,248,658 | 1962 | 20,821,230 | 1961 | 20,473,198 | 1960 | 20,159,501 |
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