| Year | Value | | 2022 | 8,978,603 | | 2021 | 8,626,902 | | 2020 | 8,276,159 | | 2019 | 7,915,853 | | 2018 | 7,585,091 | | 2017 | 7,296,821 | | 2016 | 7,038,445 | | 2015 | 6,810,516 | | 2014 | 6,605,699 | | 2013 | 6,414,553 | | 2012 | 6,230,157 | | 2011 | 6,053,611 | | 2010 | 5,885,755 | | 2009 | 5,726,322 | | 2008 | 5,568,419 | | 2007 | 5,423,270 | | 2006 | 5,287,053 | | 2005 | 5,156,194 | | 2004 | 5,031,626 | | 2003 | 4,909,460 | | 2002 | 4,782,168 | | 2001 | 4,647,018 | | 2000 | 4,506,088 | | 1999 | 4,359,366 | | 1998 | 4,206,257 | | 1997 | 4,049,417 | | 1996 | 3,893,288 | | 1995 | 3,739,931 | | 1994 | 3,589,373 | | 1993 | 3,442,734 | | 1992 | 3,305,397 | | 1991 | 3,181,053 | | 1990 | 3,072,085 | | 1989 | 2,980,246 | | 1988 | 2,904,232 | | 1987 | 2,837,757 | | 1986 | 2,773,028 | | 1985 | 2,705,217 | | 1984 | 2,632,036 | | 1983 | 2,551,836 | | 1982 | 2,465,958 | | 1981 | 2,379,431 | | 1980 | 2,296,326 | | 1979 | 2,216,008 | | 1978 | 2,138,374 | | 1977 | 2,064,861 | | 1976 | 1,994,294 | | 1975 | 1,924,878 | | 1974 | 1,855,913 | | 1973 | 1,787,735 | | 1972 | 1,720,457 | | 1971 | 1,653,640 | | 1970 | 1,588,203 | | 1969 | 1,524,491 | | 1968 | 1,461,084 | | 1967 | 1,399,184 | | 1966 | 1,341,572 | | 1965 | 1,290,882 | | 1964 | 1,247,452 | | 1963 | 1,209,941 | | 1962 | 1,175,889 | | 1961 | 1,143,111 | | 1960 | 1,108,991 |
|