| Year | Value | | 2022 | 26,544,440 | | 2021 | 26,085,557 | | 2020 | 25,617,115 | | 2019 | 25,130,176 | | 2018 | 24,635,110 | | 2017 | 24,124,786 | | 2016 | 23,594,371 | | 2015 | 23,057,113 | | 2014 | 22,519,314 | | 2013 | 21,977,315 | | 2012 | 21,436,918 | | 2011 | 20,898,466 | | 2010 | 20,364,317 | | 2009 | 19,773,206 | | 2008 | 19,150,609 | | 2007 | 18,520,504 | | 2006 | 17,889,347 | | 2005 | 17,263,520 | | 2004 | 16,642,423 | | 2003 | 16,026,190 | | 2002 | 15,416,400 | | 2001 | 14,813,423 | | 2000 | 14,220,716 | | 1999 | 13,587,168 | | 1998 | 12,976,400 | | 1997 | 12,374,884 | | 1996 | 11,786,345 | | 1995 | 11,213,830 | | 1994 | 10,656,646 | | 1993 | 10,117,305 | | 1992 | 9,599,428 | | 1991 | 9,112,513 | | 1990 | 8,722,442 | | 1989 | 8,341,912 | | 1988 | 7,970,153 | | 1987 | 7,607,707 | | 1986 | 7,261,420 | | 1985 | 6,933,576 | | 1984 | 6,626,381 | | 1983 | 6,338,170 | | 1982 | 6,065,949 | | 1981 | 5,806,596 | | 1980 | 5,556,412 | | 1979 | 5,299,097 | | 1978 | 5,051,551 | | 1977 | 4,813,156 | | 1976 | 4,587,644 | | 1975 | 4,374,389 | | 1974 | 4,170,669 | | 1973 | 3,976,364 | | 1972 | 3,791,800 | | 1971 | 3,616,467 | | 1970 | 3,447,939 | | 1969 | 3,293,089 | | 1968 | 3,144,095 | | 1967 | 2,999,576 | | 1966 | 2,858,487 | | 1965 | 2,719,396 | | 1964 | 2,582,918 | | 1963 | 2,450,091 | | 1962 | 2,322,041 | | 1961 | 2,199,658 | | 1960 | 2,083,629 |
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