| Year | Value | | 2022 | 17,234,034 | | 2021 | 17,118,329 | | 2020 | 16,931,587 | | 2019 | 16,686,776 | | 2018 | 16,375,738 | | 2017 | 16,070,668 | | 2016 | 15,809,289 | | 2015 | 15,611,340 | | 2014 | 15,441,376 | | 2013 | 15,276,709 | | 2012 | 15,120,117 | | 2011 | 14,963,678 | | 2010 | 14,806,204 | | 2009 | 14,647,961 | | 2008 | 14,488,641 | | 2007 | 14,334,623 | | 2006 | 14,185,272 | | 2005 | 14,037,420 | | 2004 | 13,891,581 | | 2003 | 13,744,299 | | 2002 | 13,591,764 | | 2001 | 13,406,973 | | 2000 | 13,213,754 | | 1999 | 13,018,021 | | 1998 | 12,818,765 | | 1997 | 12,613,368 | | 1996 | 12,402,845 | | 1995 | 12,188,680 | | 1994 | 11,968,656 | | 1993 | 11,744,086 | | 1992 | 11,517,039 | | 1991 | 11,310,391 | | 1990 | 11,110,740 | | 1989 | 10,915,528 | | 1988 | 10,724,071 | | 1987 | 10,536,991 | | 1986 | 10,356,376 | | 1985 | 10,184,561 | | 1984 | 10,020,929 | | 1983 | 9,863,736 | | 1982 | 9,708,759 | | 1981 | 9,517,007 | | 1980 | 9,318,432 | | 1979 | 9,122,030 | | 1978 | 8,925,346 | | 1977 | 8,728,170 | | 1976 | 8,533,902 | | 1975 | 8,339,903 | | 1974 | 8,145,490 | | 1973 | 7,953,428 | | 1972 | 7,764,351 | | 1971 | 7,576,446 | | 1970 | 7,387,653 | | 1969 | 7,198,481 | | 1968 | 7,009,854 | | 1967 | 6,821,792 | | 1966 | 6,635,508 | | 1965 | 6,449,009 | | 1964 | 6,261,811 | | 1963 | 6,076,516 | | 1962 | 5,892,337 | | 1961 | 5,708,073 | | 1960 | 5,523,085 |
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