| Year | Value | | 2022 | 19,063,333 | | 2021 | 19,075,060 | | 2020 | 19,113,690 | | 2019 | 19,072,810 | | 2018 | 18,895,910 | | 2017 | 18,643,029 | | 2016 | 18,331,820 | | 2015 | 18,005,071 | | 2014 | 17,672,198 | | 2013 | 17,245,595 | | 2012 | 16,721,733 | | 2011 | 16,178,863 | | 2010 | 15,594,580 | | 2009 | 14,954,918 | | 2008 | 14,343,596 | | 2007 | 13,775,710 | | 2006 | 13,245,021 | | 2005 | 12,784,077 | | 2004 | 12,391,389 | | 2003 | 12,037,130 | | 2002 | 11,719,499 | | 2001 | 11,399,078 | | 2000 | 11,051,045 | | 1999 | 10,709,966 | | 1998 | 10,379,051 | | 1997 | 10,063,725 | | 1996 | 9,760,544 | | 1995 | 9,458,190 | | 1994 | 9,161,479 | | 1993 | 8,908,501 | | 1992 | 8,648,220 | | 1991 | 8,345,156 | | 1990 | 8,038,874 | | 1989 | 7,703,529 | | 1988 | 7,456,411 | | 1987 | 7,218,308 | | 1986 | 6,963,022 | | 1985 | 6,695,191 | | 1984 | 6,430,423 | | 1983 | 6,157,474 | | 1982 | 5,885,466 | | 1981 | 5,603,286 | | 1980 | 5,328,422 | | 1979 | 5,078,245 | | 1978 | 4,851,143 | | 1977 | 4,647,238 | | 1976 | 4,447,625 | | 1975 | 4,281,170 | | 1974 | 4,159,477 | | 1973 | 4,073,995 | | 1972 | 4,020,272 | | 1971 | 3,988,588 | | 1970 | 3,960,704 | | 1969 | 3,930,657 | | 1968 | 3,896,955 | | 1967 | 3,855,210 | | 1966 | 3,804,390 | | 1965 | 3,748,934 | | 1964 | 3,684,994 | | 1963 | 3,613,370 | | 1962 | 3,540,082 | | 1961 | 3,468,093 | | 1960 | 3,401,357 |
|