Year | Value | 2022 | 31,967,115 | 2021 | 31,937,901 | 2020 | 31,732,542 | 2019 | 31,532,455 | 2018 | 31,389,562 | 2017 | 31,308,409 | 2016 | 31,308,064 | 2015 | 31,309,056 | 2014 | 31,291,128 | 2013 | 31,339,187 | 2012 | 31,385,691 | 2011 | 31,351,505 | 2010 | 31,397,853 | 2009 | 31,503,659 | 2008 | 31,653,795 | 2007 | 31,789,886 | 2006 | 32,010,113 | 2005 | 32,248,586 | 2004 | 32,342,153 | 2003 | 32,219,781 | 2002 | 32,010,906 | 2001 | 31,727,014 | 2000 | 31,310,831 | 1999 | 30,907,279 | 1998 | 30,559,966 | 1997 | 30,166,691 | 1996 | 29,762,191 | 1995 | 29,444,520 | 1994 | 29,221,979 | 1993 | 28,954,116 | 1992 | 28,591,350 | 1991 | 28,058,334 | 1990 | 26,878,484 | 1989 | 25,233,680 | 1988 | 23,663,434 | 1987 | 22,340,361 | 1986 | 21,610,048 | 1985 | 21,926,671 | 1984 | 22,964,687 | 1983 | 24,163,924 | 1982 | 25,359,071 | 1981 | 26,059,691 | 1980 | 26,105,192 | 1979 | 25,689,186 | 1978 | 24,943,439 | 1977 | 24,225,662 | 1976 | 23,788,590 | 1975 | 23,756,488 | 1974 | 24,096,385 | 1973 | 24,641,042 | 1972 | 25,052,744 | 1971 | 25,086,941 | 1970 | 24,690,964 | 1969 | 23,928,593 | 1968 | 22,945,252 | 1967 | 21,849,454 | 1966 | 20,837,020 | 1965 | 20,004,704 | 1964 | 19,077,384 | 1963 | 17,906,210 | 1962 | 16,635,474 | 1961 | 15,464,653 | 1960 | 14,653,551 |
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