| Year | Value | | 2022 | 17,618,351 | | 2021 | 17,527,219 | | 2020 | 17,490,538 | | 2019 | 17,381,928 | | 2018 | 17,177,200 | | 2017 | 17,000,888 | | 2016 | 16,848,603 | | 2015 | 16,718,932 | | 2014 | 16,627,199 | | 2013 | 16,515,541 | | 2012 | 16,341,814 | | 2011 | 16,126,119 | | 2010 | 15,825,422 | | 2009 | 15,374,053 | | 2008 | 14,851,580 | | 2007 | 14,299,835 | | 2006 | 13,743,579 | | 2005 | 13,247,511 | | 2004 | 12,813,316 | | 2003 | 12,414,304 | | 2002 | 12,030,899 | | 2001 | 11,662,949 | | 2000 | 11,311,327 | | 1999 | 10,982,158 | | 1998 | 10,678,572 | | 1997 | 10,384,266 | | 1996 | 10,099,422 | | 1995 | 9,826,157 | | 1994 | 9,551,513 | | 1993 | 9,264,093 | | 1992 | 8,990,563 | | 1991 | 8,731,551 | | 1990 | 8,488,192 | | 1989 | 8,173,947 | | 1988 | 7,905,897 | | 1987 | 7,638,536 | | 1986 | 7,385,247 | | 1985 | 7,155,058 | | 1984 | 6,933,694 | | 1983 | 6,722,952 | | 1982 | 6,511,294 | | 1981 | 6,281,575 | | 1980 | 6,033,445 | | 1979 | 5,767,732 | | 1978 | 5,518,202 | | 1977 | 5,296,268 | | 1976 | 5,071,501 | | 1975 | 4,854,808 | | 1974 | 4,653,626 | | 1973 | 4,458,777 | | 1972 | 4,274,093 | | 1971 | 4,106,561 | | 1970 | 3,964,825 | | 1969 | 3,852,949 | | 1968 | 3,770,228 | | 1967 | 3,712,954 | | 1966 | 3,672,284 | | 1965 | 3,635,867 | | 1964 | 3,597,574 | | 1963 | 3,554,859 | | 1962 | 3,506,452 | | 1961 | 3,455,437 | | 1960 | 3,408,243 |
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