| Year | Value | | 2022 | 15,242,808 | | 2021 | 15,144,169 | | 2020 | 15,057,163 | | 2019 | 15,000,405 | | 2018 | 14,991,292 | | 2017 | 15,003,900 | | 2016 | 15,012,948 | | 2015 | 14,998,246 | | 2014 | 14,933,184 | | 2013 | 14,801,798 | | 2012 | 14,619,572 | | 2011 | 14,387,832 | | 2010 | 14,131,100 | | 2009 | 13,903,551 | | 2008 | 13,716,003 | | 2007 | 13,566,451 | | 2006 | 13,460,571 | | 2005 | 13,365,689 | | 2004 | 13,245,670 | | 2003 | 13,104,361 | | 2002 | 12,939,569 | | 2001 | 12,752,316 | | 2000 | 12,557,632 | | 1999 | 12,378,784 | | 1998 | 12,212,545 | | 1997 | 12,058,760 | | 1996 | 11,912,358 | | 1995 | 11,755,049 | | 1994 | 11,584,838 | | 1993 | 11,391,595 | | 1992 | 11,168,341 | | 1991 | 10,892,358 | | 1990 | 10,563,383 | | 1989 | 10,217,140 | | 1988 | 9,872,735 | | 1987 | 9,530,651 | | 1986 | 9,183,804 | | 1985 | 8,825,683 | | 1984 | 8,461,475 | | 1983 | 8,094,796 | | 1982 | 7,729,242 | | 1981 | 7,380,360 | | 1980 | 7,068,893 | | 1979 | 6,806,628 | | 1978 | 6,580,307 | | 1977 | 6,372,173 | | 1976 | 6,177,341 | | 1975 | 5,994,339 | | 1974 | 5,821,468 | | 1973 | 5,660,778 | | 1972 | 5,513,562 | | 1971 | 5,386,934 | | 1970 | 5,266,903 | | 1969 | 5,141,795 | | 1968 | 5,016,993 | | 1967 | 4,888,607 | | 1966 | 4,758,723 | | 1965 | 4,628,051 | | 1964 | 4,494,222 | | 1963 | 4,357,020 | | 1962 | 4,217,903 | | 1961 | 4,076,849 | | 1960 | 3,934,227 |
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