| Year | Value | | 2022 | 15,429,586 | | 2021 | 15,184,150 | | 2020 | 15,110,254 | | 2019 | 14,991,273 | | 2018 | 14,682,638 | | 2017 | 14,364,501 | | 2016 | 14,124,969 | | 2015 | 13,975,740 | | 2014 | 13,761,419 | | 2013 | 13,473,465 | | 2012 | 13,177,067 | | 2011 | 12,874,436 | | 2010 | 12,546,820 | | 2009 | 12,159,682 | | 2008 | 11,737,168 | | 2007 | 11,316,699 | | 2006 | 10,901,784 | | 2005 | 10,497,404 | | 2004 | 10,172,103 | | 2003 | 9,929,220 | | 2002 | 9,695,331 | | 2001 | 9,462,097 | | 2000 | 9,230,142 | | 1999 | 8,998,032 | | 1998 | 8,766,283 | | 1997 | 8,537,038 | | 1996 | 8,309,322 | | 1995 | 8,082,656 | | 1994 | 7,862,930 | | 1993 | 7,646,481 | | 1992 | 7,410,436 | | 1991 | 7,153,327 | | 1990 | 6,890,505 | | 1989 | 6,628,660 | | 1988 | 6,371,907 | | 1987 | 6,121,999 | | 1986 | 5,879,990 | | 1985 | 5,645,732 | | 1984 | 5,419,502 | | 1983 | 5,201,815 | | 1982 | 4,993,016 | | 1981 | 4,793,086 | | 1980 | 4,601,297 | | 1979 | 4,417,425 | | 1978 | 4,241,235 | | 1977 | 4,072,394 | | 1976 | 3,910,534 | | 1975 | 3,753,646 | | 1974 | 3,585,454 | | 1973 | 3,410,118 | | 1972 | 3,247,651 | | 1971 | 3,100,232 | | 1970 | 2,967,691 | | 1969 | 2,847,012 | | 1968 | 2,735,195 | | 1967 | 2,630,561 | | 1966 | 2,532,765 | | 1965 | 2,441,017 | | 1964 | 2,354,065 | | 1963 | 2,271,717 | | 1962 | 2,194,003 | | 1961 | 2,120,945 | | 1960 | 2,052,887 |
|