| Year | Value | | 2022 | 15,948,398 | | 2021 | 15,642,746 | | 2020 | 15,271,912 | | 2019 | 14,844,172 | | 2018 | 14,379,374 | | 2017 | 13,918,217 | | 2016 | 13,464,209 | | 2015 | 13,008,743 | | 2014 | 12,543,378 | | 2013 | 12,085,075 | | 2012 | 11,674,840 | | 2011 | 11,319,673 | | 2010 | 10,996,318 | | 2009 | 10,696,255 | | 2008 | 10,428,366 | | 2007 | 10,164,533 | | 2006 | 9,893,664 | | 2005 | 9,626,381 | | 2004 | 9,361,186 | | 2003 | 9,100,325 | | 2002 | 8,859,726 | | 2001 | 8,601,746 | | 2000 | 8,309,699 | | 1999 | 8,019,779 | | 1998 | 7,732,306 | | 1997 | 7,455,746 | | 1996 | 7,220,088 | | 1995 | 7,008,359 | | 1994 | 6,797,287 | | 1993 | 6,617,777 | | 1992 | 6,440,822 | | 1991 | 6,218,816 | | 1990 | 5,958,681 | | 1989 | 5,703,454 | | 1988 | 5,465,640 | | 1987 | 5,227,182 | | 1986 | 4,994,117 | | 1985 | 4,764,983 | | 1984 | 4,533,218 | | 1983 | 4,309,836 | | 1982 | 4,110,932 | | 1981 | 3,919,522 | | 1980 | 3,761,814 | | 1979 | 3,660,294 | | 1978 | 3,604,167 | | 1977 | 3,575,694 | | 1976 | 3,544,542 | | 1975 | 3,513,578 | | 1974 | 3,490,365 | | 1973 | 3,464,952 | | 1972 | 3,431,614 | | 1971 | 3,393,215 | | 1970 | 3,350,158 | | 1969 | 3,299,012 | | 1968 | 3,237,841 | | 1967 | 3,170,428 | | 1966 | 3,101,795 | | 1965 | 3,036,396 | | 1964 | 2,973,883 | | 1963 | 2,912,977 | | 1962 | 2,851,582 | | 1961 | 2,785,281 | | 1960 | 2,712,246 |
|