| Year | Value | | 2022 | 18,321,015 | | 2021 | 17,812,218 | | 2020 | 17,298,983 | | 2019 | 16,776,694 | | 2018 | 16,257,756 | | 2017 | 15,752,585 | | 2016 | 15,263,020 | | 2015 | 14,784,578 | | 2014 | 14,317,308 | | 2013 | 13,864,596 | | 2012 | 13,423,670 | | 2011 | 12,998,684 | | 2010 | 12,595,597 | | 2009 | 12,217,345 | | 2008 | 11,864,369 | | 2007 | 11,530,824 | | 2006 | 11,211,765 | | 2005 | 10,897,890 | | 2004 | 10,561,505 | | 2003 | 10,219,584 | | 2002 | 9,913,318 | | 2001 | 9,635,534 | | 2000 | 9,373,356 | | 1999 | 9,141,736 | | 1998 | 8,923,437 | | 1997 | 8,685,064 | | 1996 | 8,437,348 | | 1995 | 8,195,744 | | 1994 | 7,977,869 | | 1993 | 7,787,709 | | 1992 | 7,613,233 | | 1991 | 7,449,180 | | 1990 | 7,284,249 | | 1989 | 7,114,361 | | 1988 | 6,951,494 | | 1987 | 6,795,005 | | 1986 | 6,640,973 | | 1985 | 6,496,316 | | 1984 | 6,358,154 | | 1983 | 6,218,640 | | 1982 | 6,074,462 | | 1981 | 5,928,317 | | 1980 | 5,794,575 | | 1979 | 5,667,156 | | 1978 | 5,531,740 | | 1977 | 5,402,786 | | 1976 | 5,281,694 | | 1975 | 5,160,482 | | 1974 | 5,041,753 | | 1973 | 4,922,657 | | 1972 | 4,803,703 | | 1971 | 4,686,904 | | 1970 | 4,569,898 | | 1969 | 4,455,783 | | 1968 | 4,348,092 | | 1967 | 4,245,682 | | 1966 | 4,147,218 | | 1965 | 4,052,227 | | 1964 | 3,960,379 | | 1963 | 3,872,772 | | 1962 | 3,788,922 | | 1961 | 3,707,319 | | 1960 | 3,629,461 |
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