| Year | Value | | 2022 | 22,593,590 | | 2021 | 21,904,983 | | 2020 | 21,224,040 | | 2019 | 20,567,424 | | 2018 | 19,934,298 | | 2017 | 19,311,355 | | 2016 | 18,700,106 | | 2015 | 18,112,907 | | 2014 | 17,551,814 | | 2013 | 17,004,033 | | 2012 | 16,514,687 | | 2011 | 16,039,734 | | 2010 | 15,529,181 | | 2009 | 15,032,635 | | 2008 | 14,551,117 | | 2007 | 14,080,912 | | 2006 | 13,623,541 | | 2005 | 13,180,551 | | 2004 | 12,751,995 | | 2003 | 12,342,165 | | 2002 | 11,952,660 | | 2001 | 11,583,824 | | 2000 | 11,239,101 | | 1999 | 10,916,993 | | 1998 | 10,620,475 | | 1997 | 10,359,301 | | 1996 | 10,131,906 | | 1995 | 9,921,094 | | 1994 | 9,711,797 | | 1993 | 9,506,510 | | 1992 | 9,310,572 | | 1991 | 9,123,969 | | 1990 | 8,945,026 | | 1989 | 8,774,122 | | 1988 | 8,617,474 | | 1987 | 8,474,329 | | 1986 | 8,334,588 | | 1985 | 8,187,651 | | 1984 | 8,030,099 | | 1983 | 7,863,944 | | 1982 | 7,696,349 | | 1981 | 7,532,864 | | 1980 | 7,372,581 | | 1979 | 7,218,079 | | 1978 | 7,072,938 | | 1977 | 6,935,336 | | 1976 | 6,807,648 | | 1975 | 6,687,293 | | 1974 | 6,569,273 | | 1973 | 6,455,257 | | 1972 | 6,347,158 | | 1971 | 6,247,878 | | 1970 | 6,153,587 | | 1969 | 6,061,764 | | 1968 | 5,973,762 | | 1967 | 5,888,497 | | 1966 | 5,806,572 | | 1965 | 5,726,382 | | 1964 | 5,647,380 | | 1963 | 5,570,462 | | 1962 | 5,494,845 | | 1961 | 5,420,247 | | 1960 | 5,346,792 |
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