| Year | Value | | 2022 | 24,794,653 | | 2021 | 23,054,803 | | 2020 | 21,483,074 | | 2019 | 20,001,757 | | 2018 | 18,798,938 | | 2017 | 17,752,941 | | 2016 | 16,958,358 | | 2015 | 16,423,553 | | 2014 | 16,017,802 | | 2013 | 15,738,873 | | 2012 | 15,588,292 | | 2011 | 15,394,843 | | 2010 | 15,196,120 | | 2009 | 15,099,468 | | 2008 | 15,010,379 | | 2007 | 14,766,388 | | 2006 | 14,375,087 | | 2005 | 13,949,062 | | 2004 | 13,497,892 | | 2003 | 12,977,669 | | 2002 | 12,487,584 | | 2001 | 12,049,599 | | 2000 | 11,611,204 | | 1999 | 11,216,516 | | 1998 | 10,802,845 | | 1997 | 10,335,224 | | 1996 | 9,939,756 | | 1995 | 9,551,196 | | 1994 | 9,079,515 | | 1993 | 8,614,585 | | 1992 | 8,237,190 | | 1991 | 7,908,789 | | 1990 | 7,608,268 | | 1989 | 7,386,875 | | 1988 | 7,235,523 | | 1987 | 7,049,495 | | 1986 | 6,802,801 | | 1985 | 6,541,192 | | 1984 | 6,261,452 | | 1983 | 5,970,978 | | 1982 | 5,725,758 | | 1981 | 5,544,391 | | 1980 | 5,382,964 | | 1979 | 5,198,855 | | 1978 | 5,019,286 | | 1977 | 4,869,621 | | 1976 | 4,717,941 | | 1975 | 4,539,188 | | 1974 | 4,330,989 | | 1973 | 4,103,095 | | 1972 | 3,893,064 | | 1971 | 3,710,546 | | 1970 | 3,561,427 | | 1969 | 3,474,858 | | 1968 | 3,415,756 | | 1967 | 3,346,598 | | 1966 | 3,269,554 | | 1965 | 3,185,901 | | 1964 | 3,132,676 | | 1963 | 3,110,754 | | 1962 | 3,089,787 | | 1961 | 3,135,902 | | 1960 | 3,293,327 |
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