| Year | Value | | 2022 | 16,495,048 | | 2021 | 16,622,633 | | 2020 | 16,778,907 | | 2019 | 16,913,179 | | 2018 | 17,013,421 | | 2017 | 17,095,562 | | 2016 | 17,170,141 | | 2015 | 17,223,510 | | 2014 | 17,224,350 | | 2013 | 17,150,900 | | 2012 | 17,002,311 | | 2011 | 16,764,469 | | 2010 | 16,414,979 | | 2009 | 15,985,623 | | 2008 | 15,527,127 | | 2007 | 15,011,033 | | 2006 | 14,458,485 | | 2005 | 13,910,489 | | 2004 | 13,355,070 | | 2003 | 12,823,496 | | 2002 | 12,384,360 | | 2001 | 11,990,581 | | 2000 | 11,600,648 | | 1999 | 11,258,093 | | 1998 | 10,953,013 | | 1997 | 10,668,331 | | 1996 | 10,400,970 | | 1995 | 10,143,466 | | 1994 | 9,890,740 | | 1993 | 9,692,226 | | 1992 | 9,493,062 | | 1991 | 9,217,203 | | 1990 | 8,870,316 | | 1989 | 8,533,119 | | 1988 | 8,255,486 | | 1987 | 7,980,391 | | 1986 | 7,722,386 | | 1985 | 7,483,754 | | 1984 | 7,245,967 | | 1983 | 7,014,598 | | 1982 | 6,795,522 | | 1981 | 6,494,646 | | 1980 | 6,178,472 | | 1979 | 5,942,971 | | 1978 | 5,719,718 | | 1977 | 5,488,110 | | 1976 | 5,245,023 | | 1975 | 5,000,858 | | 1974 | 4,749,264 | | 1973 | 4,510,838 | | 1972 | 4,304,272 | | 1971 | 4,127,575 | | 1970 | 3,987,108 | | 1969 | 3,886,022 | | 1968 | 3,824,392 | | 1967 | 3,793,616 | | 1966 | 3,779,815 | | 1965 | 3,766,354 | | 1964 | 3,748,601 | | 1963 | 3,728,151 | | 1962 | 3,701,784 | | 1961 | 3,669,065 | | 1960 | 3,633,782 |
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