| Year | Value | | 2022 | 18,939,898 | | 2021 | 18,275,667 | | 2020 | 17,640,922 | | 2019 | 17,021,719 | | 2018 | 16,427,514 | | 2017 | 15,866,164 | | 2016 | 15,321,665 | | 2015 | 14,807,208 | | 2014 | 14,350,165 | | 2013 | 13,951,216 | | 2012 | 13,603,761 | | 2011 | 13,249,366 | | 2010 | 12,889,011 | | 2009 | 12,544,507 | | 2008 | 12,198,830 | | 2007 | 11,835,280 | | 2006 | 11,433,504 | | 2005 | 11,017,238 | | 2004 | 10,626,387 | | 2003 | 10,258,229 | | 2002 | 9,887,046 | | 2001 | 9,534,442 | | 2000 | 9,243,496 | | 1999 | 8,985,338 | | 1998 | 8,740,167 | | 1997 | 8,525,140 | | 1996 | 8,319,166 | | 1995 | 8,094,366 | | 1994 | 7,856,474 | | 1993 | 7,606,587 | | 1992 | 7,328,565 | | 1991 | 7,062,364 | | 1990 | 6,866,898 | | 1989 | 6,697,558 | | 1988 | 6,536,557 | | 1987 | 6,427,042 | | 1986 | 6,351,193 | | 1985 | 6,256,666 | | 1984 | 6,141,129 | | 1983 | 6,031,374 | | 1982 | 5,903,220 | | 1981 | 5,776,563 | | 1980 | 5,682,041 | | 1979 | 5,578,468 | | 1978 | 5,449,120 | | 1977 | 5,328,232 | | 1976 | 5,218,179 | | 1975 | 5,098,038 | | 1974 | 4,970,875 | | 1973 | 4,841,002 | | 1972 | 4,716,275 | | 1971 | 4,596,236 | | 1970 | 4,479,212 | | 1969 | 4,368,339 | | 1968 | 4,261,152 | | 1967 | 4,158,961 | | 1966 | 4,065,000 | | 1965 | 3,977,101 | | 1964 | 3,892,069 | | 1963 | 3,812,319 | | 1962 | 3,736,588 | | 1961 | 3,661,344 | | 1960 | 3,588,891 |
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