| Year | Value | | 2022 | 17,920,335 | | 2021 | 17,643,718 | | 2020 | 17,357,212 | | 2019 | 17,079,979 | | 2018 | 16,816,470 | | 2017 | 16,564,625 | | 2016 | 16,323,945 | | 2015 | 16,085,728 | | 2014 | 15,834,051 | | 2013 | 15,559,265 | | 2012 | 15,248,849 | | 2011 | 14,900,964 | | 2010 | 14,537,394 | | 2009 | 14,164,657 | | 2008 | 13,786,887 | | 2007 | 13,418,757 | | 2006 | 13,057,178 | | 2005 | 12,691,839 | | 2004 | 12,321,312 | | 2003 | 11,938,133 | | 2002 | 11,554,664 | | 2001 | 11,197,160 | | 2000 | 10,870,834 | | 1999 | 10,576,836 | | 1998 | 10,316,523 | | 1997 | 10,069,244 | | 1996 | 9,815,153 | | 1995 | 9,559,246 | | 1994 | 9,310,031 | | 1993 | 9,069,449 | | 1992 | 8,842,980 | | 1991 | 8,639,551 | | 1990 | 8,458,293 | | 1989 | 8,295,507 | | 1988 | 8,157,853 | | 1987 | 8,035,637 | | 1986 | 7,908,996 | | 1985 | 7,770,327 | | 1984 | 7,614,664 | | 1983 | 7,463,887 | | 1982 | 7,296,489 | | 1981 | 7,092,089 | | 1980 | 6,876,157 | | 1979 | 6,650,000 | | 1978 | 6,411,394 | | 1977 | 6,170,350 | | 1976 | 5,939,409 | | 1975 | 5,716,173 | | 1974 | 5,503,751 | | 1973 | 5,313,997 | | 1972 | 5,146,568 | | 1971 | 4,996,538 | | 1970 | 4,864,830 | | 1969 | 4,747,725 | | 1968 | 4,637,234 | | 1967 | 4,531,969 | | 1966 | 4,424,909 | | 1965 | 4,313,117 | | 1964 | 4,202,217 | | 1963 | 4,093,629 | | 1962 | 3,989,776 | | 1961 | 3,891,848 | | 1960 | 3,799,794 |
|