Year | Value | 2022 | 19,583,244 | 2021 | 19,230,969 | 2020 | 19,121,762 | 2019 | 18,921,018 | 2018 | 18,659,541 | 2017 | 18,406,915 | 2016 | 18,192,222 | 2015 | 17,988,513 | 2014 | 17,855,282 | 2013 | 17,680,037 | 2012 | 17,500,980 | 2011 | 17,318,413 | 2010 | 17,152,260 | 2009 | 16,962,677 | 2008 | 16,769,997 | 2007 | 16,588,348 | 2006 | 16,427,039 | 2005 | 16,263,117 | 2004 | 16,112,389 | 2003 | 15,963,984 | 2002 | 15,821,972 | 2001 | 15,654,835 | 2000 | 15,492,171 | 1999 | 15,353,410 | 1998 | 15,229,531 | 1997 | 15,103,624 | 1996 | 14,956,383 | 1995 | 14,799,796 | 1994 | 14,643,061 | 1993 | 14,478,794 | 1992 | 14,312,897 | 1991 | 14,138,442 | 1990 | 13,963,399 | 1989 | 13,751,532 | 1988 | 13,500,396 | 1987 | 13,321,982 | 1986 | 13,145,756 | 1985 | 13,012,495 | 1984 | 12,887,917 | 1983 | 12,759,260 | 1982 | 12,625,723 | 1981 | 12,468,647 | 1980 | 12,308,181 | 1979 | 12,142,187 | 1978 | 12,011,533 | 1977 | 11,879,181 | 1976 | 11,727,923 | 1975 | 11,562,890 | 1974 | 11,386,049 | 1973 | 11,220,294 | 1972 | 11,074,818 | 1971 | 10,944,078 | 1970 | 10,633,366 | 1969 | 10,486,530 | 1968 | 10,337,254 | 1967 | 10,166,027 | 1966 | 9,978,791 | 1965 | 9,786,254 | 1964 | 9,600,426 | 1963 | 9,409,673 | 1962 | 9,223,459 | 1961 | 9,040,809 | 1960 | 8,850,971 |
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