| Year | Value | | 2022 | 17,213,307 | | 2021 | 16,918,421 | | 2020 | 16,636,518 | | 2019 | 16,363,966 | | 2018 | 16,104,740 | | 2017 | 15,854,871 | | 2016 | 15,610,256 | | 2015 | 15,372,077 | | 2014 | 15,142,977 | | 2013 | 14,919,480 | | 2012 | 14,696,854 | | 2011 | 14,477,757 | | 2010 | 14,266,587 | | 2009 | 14,065,094 | | 2008 | 13,891,315 | | 2007 | 13,719,323 | | 2006 | 13,528,193 | | 2005 | 13,337,081 | | 2004 | 13,141,153 | | 2003 | 12,939,374 | | 2002 | 12,731,400 | | 2001 | 12,519,714 | | 2000 | 12,306,734 | | 1999 | 12,090,526 | | 1998 | 11,869,350 | | 1997 | 11,644,677 | | 1996 | 11,421,649 | | 1995 | 11,202,020 | | 1994 | 10,984,786 | | 1993 | 10,768,428 | | 1992 | 10,553,993 | | 1991 | 10,340,178 | | 1990 | 10,122,330 | | 1989 | 9,899,602 | | 1988 | 9,676,644 | | 1987 | 9,452,769 | | 1986 | 9,224,761 | | 1985 | 8,991,961 | | 1984 | 8,755,020 | | 1983 | 8,516,701 | | 1982 | 8,335,789 | | 1981 | 8,180,284 | | 1980 | 8,022,752 | | 1979 | 7,864,755 | | 1978 | 7,709,095 | | 1977 | 7,554,802 | | 1976 | 7,405,199 | | 1975 | 7,258,958 | | 1974 | 7,114,580 | | 1973 | 6,971,395 | | 1972 | 6,739,973 | | 1971 | 6,480,456 | | 1970 | 6,228,963 | | 1969 | 5,984,786 | | 1968 | 5,748,717 | | 1967 | 5,520,741 | | 1966 | 5,302,503 | | 1965 | 5,093,201 | | 1964 | 4,893,076 | | 1963 | 4,702,253 | | 1962 | 4,519,511 | | 1961 | 4,344,260 | | 1960 | 4,176,021 |
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