| Year | Value | | 2022 | 33,884,010 | | 2021 | 33,629,962 | | 2020 | 33,192,603 | | 2019 | 32,321,080 | | 2018 | 31,165,170 | | 2017 | 29,941,045 | | 2016 | 28,751,386 | | 2015 | 27,618,729 | | 2014 | 26,541,989 | | 2013 | 25,488,954 | | 2012 | 24,473,600 | | 2011 | 23,513,124 | | 2010 | 22,551,123 | | 2009 | 21,591,224 | | 2008 | 20,626,839 | | 2007 | 19,663,681 | | 2006 | 18,756,639 | | 2005 | 17,875,367 | | 2004 | 17,001,772 | | 2003 | 16,191,892 | | 2002 | 15,472,967 | | 2001 | 14,801,537 | | 2000 | 14,160,571 | | 1999 | 13,562,006 | | 1998 | 13,021,878 | | 1997 | 12,548,844 | | 1996 | 12,131,748 | | 1995 | 11,736,474 | | 1994 | 11,310,722 | | 1993 | 10,866,740 | | 1992 | 10,459,128 | | 1991 | 10,089,949 | | 1990 | 9,739,552 | | 1989 | 9,383,157 | | 1988 | 9,026,919 | | 1987 | 8,678,071 | | 1986 | 8,334,438 | | 1985 | 8,010,202 | | 1984 | 7,705,306 | | 1983 | 7,403,753 | | 1982 | 7,106,718 | | 1981 | 6,827,106 | | 1980 | 6,560,874 | | 1979 | 6,292,425 | | 1978 | 6,015,980 | | 1977 | 5,741,136 | | 1976 | 5,483,818 | | 1975 | 5,243,882 | | 1974 | 5,017,315 | | 1973 | 4,814,167 | | 1972 | 4,641,593 | | 1971 | 4,502,503 | | 1970 | 4,382,639 | | 1969 | 4,254,467 | | 1968 | 4,102,374 | | 1967 | 3,940,806 | | 1966 | 3,797,468 | | 1965 | 3,683,668 | | 1964 | 3,593,915 | | 1963 | 3,527,009 | | 1962 | 3,483,791 | | 1961 | 3,466,874 | | 1960 | 3,477,429 |
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