Year | Value | 2022 | 56,441,242 | 2021 | 54,764,289 | 2020 | 53,235,133 | 2019 | 52,064,636 | 2018 | 51,038,631 | 2017 | 49,392,954 | 2016 | 47,868,188 | 2015 | 47,574,947 | 2014 | 48,469,403 | 2013 | 50,756,999 | 2012 | 53,873,915 | 2011 | 57,024,331 | 2010 | 60,223,384 | 2009 | 62,852,563 | 2008 | 64,443,818 | 2007 | 64,668,013 | 2006 | 63,928,447 | 2005 | 63,088,744 | 2004 | 62,174,995 | 2003 | 61,924,279 | 2002 | 61,719,463 | 2001 | 58,561,335 | 2000 | 52,957,483 | 1999 | 47,480,358 | 1998 | 42,241,843 | 1997 | 39,164,310 | 1996 | 39,822,442 | 1995 | 42,265,860 | 1994 | 44,633,762 | 1993 | 45,820,441 | 1992 | 45,572,758 | 1991 | 44,733,625 | 1990 | 43,535,795 | 1989 | 41,762,592 | 1988 | 39,684,832 | 1987 | 37,287,258 | 1986 | 34,908,588 | 1985 | 32,734,629 | 1984 | 30,694,875 | 1983 | 29,029,227 | 1982 | 27,603,520 | 1981 | 26,642,825 | 1980 | 26,133,519 | 1979 | 25,787,439 | 1978 | 25,597,224 | 1977 | 25,605,954 | 1976 | 25,568,002 | 1975 | 25,482,557 | 1974 | 25,516,451 | 1973 | 25,548,488 | 1972 | 25,311,531 | 1971 | 24,804,819 | 1970 | 24,237,919 | 1969 | 23,661,457 | 1968 | 22,997,609 | 1967 | 22,386,915 | 1966 | 21,830,080 | 1965 | 21,293,172 | 1964 | 20,989,061 | 1963 | 20,736,812 | 1962 | 20,333,316 | 1961 | 20,138,614 | 1960 | 20,149,316 |
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