| Year | Value | | 2022 | 6,400,926 | | 2021 | 6,231,786 | | 2020 | 6,066,599 | | 2019 | 5,894,278 | | 2018 | 5,703,611 | | 2017 | 5,534,391 | | 2016 | 5,407,865 | | 2015 | 5,319,770 | | 2014 | 5,203,501 | | 2013 | 5,030,076 | | 2012 | 4,852,194 | | 2011 | 4,681,456 | | 2010 | 4,516,033 | | 2009 | 4,306,730 | | 2008 | 4,090,782 | | 2007 | 3,923,619 | | 2006 | 3,779,881 | | 2005 | 3,644,928 | | 2004 | 3,510,499 | | 2003 | 3,380,524 | | 2002 | 3,274,704 | | 2001 | 3,183,686 | | 2000 | 3,105,481 | | 1999 | 3,042,158 | | 1998 | 2,969,875 | | 1997 | 2,914,369 | | 1996 | 2,918,157 | | 1995 | 2,919,889 | | 1994 | 2,746,542 | | 1993 | 2,731,724 | | 1992 | 2,826,558 | | 1991 | 2,752,155 | | 1990 | 2,696,792 | | 1989 | 2,642,012 | | 1988 | 2,592,008 | | 1987 | 2,535,793 | | 1986 | 2,477,671 | | 1985 | 2,430,585 | | 1984 | 2,377,358 | | 1983 | 2,319,037 | | 1982 | 2,256,465 | | 1981 | 2,200,360 | | 1980 | 2,111,101 | | 1979 | 2,023,076 | | 1978 | 1,973,728 | | 1977 | 1,917,383 | | 1976 | 1,868,707 | | 1975 | 1,827,328 | | 1974 | 1,782,142 | | 1973 | 1,737,879 | | 1972 | 1,744,277 | | 1971 | 1,747,773 | | 1970 | 1,705,319 | | 1969 | 1,668,382 | | 1968 | 1,632,156 | | 1967 | 1,592,940 | | 1966 | 1,552,097 | | 1965 | 1,514,448 | | 1964 | 1,471,978 | | 1963 | 1,429,107 | | 1962 | 1,398,392 | | 1961 | 1,362,374 | | 1960 | 1,327,479 |
|