| Year | Value | | 2022 | 17,990,170 | | 2021 | 17,606,637 | | 2020 | 17,258,430 | | 2019 | 16,935,578 | | 2018 | 16,635,580 | | 2017 | 16,372,437 | | 2016 | 16,130,961 | | 2015 | 15,884,192 | | 2014 | 15,640,290 | | 2013 | 15,408,910 | | 2012 | 15,199,882 | | 2011 | 15,007,103 | | 2010 | 14,554,257 | | 2009 | 14,014,762 | | 2008 | 13,648,397 | | 2007 | 13,301,003 | | 2006 | 12,984,805 | | 2005 | 12,700,677 | | 2004 | 12,428,855 | | 2003 | 12,162,787 | | 2002 | 11,900,009 | | 2001 | 11,634,932 | | 2000 | 11,370,244 | | 1999 | 11,096,810 | | 1998 | 10,862,394 | | 1997 | 10,575,599 | | 1996 | 10,267,308 | | 1995 | 9,964,108 | | 1994 | 9,679,171 | | 1993 | 9,386,788 | | 1992 | 9,074,643 | | 1991 | 8,765,479 | | 1990 | 8,483,962 | | 1989 | 8,221,484 | | 1988 | 7,974,271 | | 1987 | 7,763,836 | | 1986 | 7,555,779 | | 1985 | 7,355,697 | | 1984 | 7,166,888 | | 1983 | 6,989,103 | | 1982 | 6,821,113 | | 1981 | 6,660,041 | | 1980 | 6,503,558 | | 1979 | 6,347,101 | | 1978 | 6,142,953 | | 1977 | 5,900,197 | | 1976 | 5,661,151 | | 1975 | 5,430,883 | | 1974 | 5,210,038 | | 1973 | 4,998,184 | | 1972 | 4,794,957 | | 1971 | 4,599,705 | | 1970 | 4,409,851 | | 1969 | 4,232,202 | | 1968 | 4,063,974 | | 1967 | 3,897,765 | | 1966 | 3,734,937 | | 1965 | 3,574,810 | | 1964 | 3,417,791 | | 1963 | 3,265,747 | | 1962 | 3,118,187 | | 1961 | 2,975,983 | | 1960 | 2,844,744 |
|