| Year | Value | | 2022 | 26,777,549 | | 2021 | 26,279,184 | | 2020 | 25,780,698 | | 2019 | 25,272,193 | | 2018 | 24,784,782 | | 2017 | 24,296,132 | | 2016 | 23,780,053 | | 2015 | 23,268,540 | | 2014 | 22,770,037 | | 2013 | 22,259,261 | | 2012 | 21,733,578 | | 2011 | 21,195,954 | | 2010 | 20,642,895 | | 2009 | 20,068,349 | | 2008 | 19,479,661 | | 2007 | 18,903,421 | | 2006 | 18,346,035 | | 2005 | 17,802,747 | | 2004 | 17,274,191 | | 2003 | 16,758,781 | | 2002 | 16,262,141 | | 2001 | 15,769,661 | | 2000 | 15,293,161 | | 1999 | 14,849,031 | | 1998 | 14,435,594 | | 1997 | 14,050,503 | | 1996 | 13,678,480 | | 1995 | 13,312,267 | | 1994 | 12,942,673 | | 1993 | 12,574,792 | | 1992 | 12,210,186 | | 1991 | 11,844,758 | | 1990 | 11,469,606 | | 1989 | 11,084,829 | | 1988 | 10,706,223 | | 1987 | 10,336,289 | | 1986 | 9,977,564 | | 1985 | 9,625,397 | | 1984 | 9,278,283 | | 1983 | 8,938,716 | | 1982 | 8,612,329 | | 1981 | 8,302,675 | | 1980 | 8,005,859 | | 1979 | 7,724,653 | | 1978 | 7,460,568 | | 1977 | 7,208,130 | | 1976 | 6,972,722 | | 1975 | 6,749,132 | | 1974 | 6,526,985 | | 1973 | 6,307,721 | | 1972 | 6,091,894 | | 1971 | 5,882,724 | | 1970 | 5,672,788 | | 1969 | 5,458,568 | | 1968 | 5,248,368 | | 1967 | 5,044,632 | | 1966 | 4,848,069 | | 1965 | 4,658,175 | | 1964 | 4,476,174 | | 1963 | 4,304,088 | | 1962 | 4,140,395 | | 1961 | 3,985,561 | | 1960 | 3,840,900 |
|