Year | Value | 2022 | 16,897,890 | 2021 | 16,908,424 | 2020 | 16,708,582 | 2019 | 16,506,259 | 2018 | 16,291,735 | 2017 | 16,086,941 | 2016 | 15,870,354 | 2015 | 15,626,871 | 2014 | 15,375,089 | 2013 | 15,192,121 | 2012 | 15,030,758 | 2011 | 14,836,072 | 2010 | 14,699,416 | 2009 | 14,694,484 | 2008 | 14,798,498 | 2007 | 15,012,905 | 2006 | 15,397,124 | 2005 | 15,852,822 | 2004 | 16,255,667 | 2003 | 16,500,520 | 2002 | 16,612,643 | 2001 | 16,620,022 | 2000 | 16,512,631 | 1999 | 16,393,441 | 1998 | 16,255,941 | 1997 | 16,033,030 | 1996 | 15,768,931 | 1995 | 15,496,277 | 1994 | 15,240,669 | 1993 | 14,889,970 | 1992 | 14,408,801 | 1991 | 13,843,330 | 1990 | 12,915,174 | 1989 | 11,629,050 | 1988 | 10,392,399 | 1987 | 9,527,087 | 1986 | 9,264,807 | 1985 | 9,746,863 | 1984 | 10,808,955 | 1983 | 12,138,611 | 1982 | 13,402,255 | 1981 | 14,094,554 | 1980 | 14,176,030 | 1979 | 13,789,535 | 1978 | 13,059,646 | 1977 | 12,378,163 | 1976 | 11,934,332 | 1975 | 11,880,881 | 1974 | 12,238,177 | 1973 | 12,820,332 | 1972 | 13,303,678 | 1971 | 13,595,918 | 1970 | 13,705,018 | 1969 | 13,569,895 | 1968 | 13,204,773 | 1967 | 12,643,985 | 1966 | 11,902,441 | 1965 | 11,044,144 | 1964 | 10,180,560 | 1963 | 9,453,578 | 1962 | 8,775,410 | 1961 | 8,240,710 | 1960 | 8,075,121 |
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