| Year | Value | | 2022 | 21,081,877 | | 2021 | 20,739,084 | | 2020 | 20,407,961 | | 2019 | 20,073,549 | | 2018 | 19,738,838 | | 2017 | 19,415,973 | | 2016 | 19,112,589 | | 2015 | 18,837,217 | | 2014 | 18,589,125 | | 2013 | 18,347,533 | | 2012 | 18,083,156 | | 2011 | 17,777,913 | | 2010 | 17,424,539 | | 2009 | 17,034,424 | | 2008 | 16,600,376 | | 2007 | 16,146,980 | | 2006 | 15,686,814 | | 2005 | 15,224,165 | | 2004 | 14,760,295 | | 2003 | 14,300,222 | | 2002 | 13,847,532 | | 2001 | 13,404,315 | | 2000 | 12,974,558 | | 1999 | 12,555,142 | | 1998 | 12,125,420 | | 1997 | 11,681,529 | | 1996 | 11,233,671 | | 1995 | 10,780,633 | | 1994 | 10,337,913 | | 1993 | 9,936,147 | | 1992 | 9,582,302 | | 1991 | 9,268,259 | | 1990 | 8,993,165 | | 1989 | 8,752,313 | | 1988 | 8,534,565 | | 1987 | 8,328,362 | | 1986 | 8,131,153 | | 1985 | 7,941,045 | | 1984 | 7,757,673 | | 1983 | 7,587,275 | | 1982 | 7,434,304 | | 1981 | 7,294,232 | | 1980 | 7,161,788 | | 1979 | 7,033,387 | | 1978 | 6,905,407 | | 1977 | 6,772,108 | | 1976 | 6,629,610 | | 1975 | 6,475,734 | | 1974 | 6,310,144 | | 1973 | 6,132,771 | | 1972 | 5,946,197 | | 1971 | 5,756,312 | | 1970 | 5,565,327 | | 1969 | 5,373,937 | | 1968 | 5,185,718 | | 1967 | 5,009,902 | | 1966 | 4,856,509 | | 1965 | 4,729,449 | | 1964 | 4,626,224 | | 1963 | 4,543,114 | | 1962 | 4,471,365 | | 1961 | 4,397,612 | | 1960 | 4,313,527 |
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