| Year | Value | | 2022 | 20,362,329 | | 2021 | 19,844,584 | | 2020 | 19,279,930 | | 2019 | 18,679,089 | | 2018 | 18,136,922 | | 2017 | 17,614,722 | | 2016 | 17,115,346 | | 2015 | 16,682,054 | | 2014 | 16,172,321 | | 2013 | 15,594,637 | | 2012 | 15,067,373 | | 2011 | 14,468,875 | | 2010 | 13,949,295 | | 2009 | 13,557,331 | | 2008 | 13,088,192 | | 2007 | 12,835,340 | | 2006 | 12,614,497 | | 2005 | 12,109,086 | | 2004 | 11,690,825 | | 2003 | 11,247,647 | | 2002 | 10,438,055 | | 2001 | 9,793,166 | | 2000 | 9,727,541 | | 1999 | 9,595,036 | | 1998 | 9,217,591 | | 1997 | 8,871,958 | | 1996 | 8,537,421 | | 1995 | 8,199,445 | | 1994 | 7,722,096 | | 1993 | 7,000,119 | | 1992 | 6,028,939 | | 1991 | 5,372,208 | | 1990 | 5,346,409 | | 1989 | 5,334,609 | | 1988 | 5,188,060 | | 1987 | 5,152,650 | | 1986 | 5,207,273 | | 1985 | 5,225,679 | | 1984 | 5,074,600 | | 1983 | 4,916,351 | | 1982 | 4,973,968 | | 1981 | 5,490,160 | | 1980 | 6,136,856 | | 1979 | 6,373,547 | | 1978 | 6,342,838 | | 1977 | 6,214,979 | | 1976 | 6,083,166 | | 1975 | 5,948,268 | | 1974 | 5,803,603 | | 1973 | 5,655,304 | | 1972 | 5,509,781 | | 1971 | 5,372,747 | | 1970 | 5,239,568 | | 1969 | 5,108,507 | | 1968 | 4,983,086 | | 1967 | 4,861,918 | | 1966 | 4,745,981 | | 1965 | 4,634,341 | | 1964 | 4,526,691 | | 1963 | 4,424,511 | | 1962 | 4,326,881 | | 1961 | 4,233,771 | | 1960 | 4,145,945 |
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