| Year | Value | | 2022 | 22,257,290 | | 2021 | 21,291,701 | | 2020 | 20,559,549 | | 2019 | 19,943,975 | | 2018 | 19,457,288 | | 2017 | 19,090,676 | | 2016 | 18,725,326 | | 2015 | 18,417,421 | | 2014 | 18,233,157 | | 2013 | 18,074,096 | | 2012 | 17,794,404 | | 2011 | 17,343,631 | | 2010 | 16,804,769 | | 2009 | 16,235,546 | | 2008 | 15,637,608 | | 2007 | 15,069,697 | | 2006 | 14,551,878 | | 2005 | 14,049,514 | | 2004 | 13,590,714 | | 2003 | 13,115,984 | | 2002 | 12,599,006 | | 2001 | 12,155,986 | | 2000 | 11,730,785 | | 1999 | 11,235,837 | | 1998 | 10,727,745 | | 1997 | 10,293,492 | | 1996 | 9,916,003 | | 1995 | 9,545,820 | | 1994 | 9,229,413 | | 1993 | 8,981,502 | | 1992 | 8,708,769 | | 1991 | 8,392,835 | | 1990 | 8,093,875 | | 1989 | 7,810,542 | | 1988 | 7,530,793 | | 1987 | 7,297,946 | | 1986 | 7,129,647 | | 1985 | 6,977,369 | | 1984 | 6,788,253 | | 1983 | 6,588,436 | | 1982 | 6,412,496 | | 1981 | 6,223,590 | | 1980 | 5,989,795 | | 1979 | 5,707,363 | | 1978 | 5,389,636 | | 1977 | 5,082,552 | | 1976 | 4,805,173 | | 1975 | 4,565,418 | | 1974 | 4,390,170 | | 1973 | 4,251,180 | | 1972 | 4,114,931 | | 1971 | 3,971,721 | | 1970 | 3,809,777 | | 1969 | 3,655,910 | | 1968 | 3,523,634 | | 1967 | 3,406,167 | | 1966 | 3,317,490 | | 1965 | 3,254,145 | | 1964 | 3,192,126 | | 1963 | 3,126,268 | | 1962 | 3,072,298 | | 1961 | 3,081,384 | | 1960 | 3,187,809 |
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