Year | Value | 2022 | 52,594,064 | 2021 | 55,635,658 | 2020 | 58,638,025 | 2019 | 61,020,530 | 2018 | 62,391,804 | 2017 | 62,479,007 | 2016 | 61,638,563 | 2015 | 60,737,883 | 2014 | 59,804,757 | 2013 | 59,518,072 | 2012 | 59,304,137 | 2011 | 56,276,426 | 2010 | 50,948,225 | 2009 | 45,780,404 | 2008 | 40,830,072 | 2007 | 37,945,793 | 2006 | 38,697,498 | 2005 | 41,179,376 | 2004 | 43,574,845 | 2003 | 44,804,256 | 2002 | 44,581,982 | 2001 | 43,752,806 | 2000 | 42,495,604 | 1999 | 40,603,644 | 1998 | 38,434,515 | 1997 | 35,958,791 | 1996 | 33,504,733 | 1995 | 31,281,476 | 1994 | 29,207,679 | 1993 | 27,522,881 | 1992 | 26,095,543 | 1991 | 25,106,445 | 1990 | 24,568,759 | 1989 | 24,224,737 | 1988 | 24,037,647 | 1987 | 24,042,295 | 1986 | 23,993,159 | 1985 | 23,906,611 | 1984 | 23,938,951 | 1983 | 23,970,155 | 1982 | 23,750,777 | 1981 | 23,296,918 | 1980 | 22,822,400 | 1979 | 22,305,157 | 1978 | 21,649,284 | 1977 | 21,036,481 | 1976 | 20,502,679 | 1975 | 19,975,575 | 1974 | 19,557,902 | 1973 | 19,112,297 | 1972 | 18,570,159 | 1971 | 18,152,545 | 1970 | 17,747,074 | 1969 | 17,220,411 | 1968 | 16,696,769 | 1967 | 16,310,772 | 1966 | 15,996,794 | 1965 | 15,699,395 | 1964 | 15,617,577 | 1963 | 15,727,833 | 1962 | 15,688,683 | 1961 | 15,560,885 | 1960 | 15,572,665 |
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