| Year | Value | | 2022 | 17,115,528 | | 2021 | 16,264,861 | | 2020 | 15,620,729 | | 2019 | 15,097,111 | | 2018 | 14,701,732 | | 2017 | 14,421,161 | | 2016 | 14,142,397 | | 2015 | 13,928,139 | | 2014 | 13,844,520 | | 2013 | 13,786,277 | | 2012 | 13,608,674 | | 2011 | 13,272,856 | | 2010 | 12,866,008 | | 2009 | 12,440,765 | | 2008 | 11,992,760 | | 2007 | 11,575,220 | | 2006 | 11,201,047 | | 2005 | 10,836,239 | | 2004 | 10,513,963 | | 2003 | 10,174,870 | | 2002 | 9,788,920 | | 2001 | 9,466,974 | | 2000 | 9,150,785 | | 1999 | 8,757,226 | | 1998 | 8,346,655 | | 1997 | 8,005,281 | | 1996 | 7,713,091 | | 1995 | 7,415,449 | | 1994 | 7,158,344 | | 1993 | 6,961,767 | | 1992 | 6,735,664 | | 1991 | 6,463,883 | | 1990 | 6,208,775 | | 1989 | 5,972,360 | | 1988 | 5,746,573 | | 1987 | 5,574,457 | | 1986 | 5,469,696 | | 1985 | 5,379,162 | | 1984 | 5,247,912 | | 1983 | 5,101,414 | | 1982 | 4,975,138 | | 1981 | 4,835,232 | | 1980 | 4,653,198 | | 1979 | 4,428,074 | | 1978 | 4,172,050 | | 1977 | 3,927,297 | | 1976 | 3,708,782 | | 1975 | 3,519,723 | | 1974 | 3,387,760 | | 1973 | 3,289,133 | | 1972 | 3,190,631 | | 1971 | 3,083,962 | | 1970 | 2,957,860 | | 1969 | 2,836,514 | | 1968 | 2,732,158 | | 1967 | 2,640,160 | | 1966 | 2,576,964 | | 1965 | 2,537,393 | | 1964 | 2,500,303 | | 1963 | 2,462,298 | | 1962 | 2,437,020 | | 1961 | 2,474,973 | | 1960 | 2,608,080 |
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