| Year | Value | | 2022 | 25,240,726 | | 2021 | 24,609,579 | | 2020 | 24,039,014 | | 2019 | 23,341,684 | | 2018 | 22,658,567 | | 2017 | 22,006,665 | | 2016 | 21,323,747 | | 2015 | 20,630,917 | | 2014 | 19,990,781 | | 2013 | 19,331,525 | | 2012 | 18,692,601 | | 2011 | 18,021,259 | | 2010 | 17,291,013 | | 2009 | 16,476,936 | | 2008 | 15,684,157 | | 2007 | 14,945,116 | | 2006 | 14,211,568 | | 2005 | 13,551,632 | | 2004 | 12,977,180 | | 2003 | 12,387,943 | | 2002 | 11,830,905 | | 2001 | 11,313,387 | | 2000 | 10,792,336 | | 1999 | 10,423,303 | | 1998 | 10,296,868 | | 1997 | 10,290,100 | | 1996 | 10,265,900 | | 1995 | 10,173,568 | | 1994 | 9,961,367 | | 1993 | 9,665,072 | | 1992 | 9,334,809 | | 1991 | 8,993,366 | | 1990 | 8,670,644 | | 1989 | 8,356,596 | | 1988 | 8,051,459 | | 1987 | 7,749,719 | | 1986 | 7,474,870 | | 1985 | 7,230,099 | | 1984 | 6,983,766 | | 1983 | 6,756,741 | | 1982 | 6,505,211 | | 1981 | 6,247,215 | | 1980 | 6,028,882 | | 1979 | 5,827,594 | | 1978 | 5,643,312 | | 1977 | 5,471,367 | | 1976 | 5,326,350 | | 1975 | 5,208,226 | | 1974 | 5,103,752 | | 1973 | 5,022,169 | | 1972 | 4,946,900 | | 1971 | 4,860,842 | | 1970 | 4,767,665 | | 1969 | 4,672,103 | | 1968 | 4,570,599 | | 1967 | 4,466,356 | | 1966 | 4,362,081 | | 1965 | 4,265,690 | | 1964 | 4,155,246 | | 1963 | 4,056,069 | | 1962 | 3,979,775 | | 1961 | 3,885,002 | | 1960 | 3,784,203 |
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