Year | Value | 2022 | 18,730,526 | 2021 | 18,682,511 | 2020 | 18,750,282 | 2019 | 18,798,952 | 2018 | 18,809,664 | 2017 | 18,795,376 | 2016 | 18,755,733 | 2015 | 18,624,547 | 2014 | 18,472,108 | 2013 | 18,403,327 | 2012 | 18,361,215 | 2011 | 18,334,806 | 2010 | 18,836,498 | 2009 | 19,025,087 | 2008 | 19,234,290 | 2007 | 19,432,962 | 2006 | 19,622,894 | 2005 | 19,809,155 | 2004 | 19,986,263 | 2003 | 20,157,322 | 2002 | 20,313,617 | 2001 | 20,447,486 | 2000 | 20,581,651 | 1999 | 20,723,743 | 1998 | 20,880,191 | 1997 | 21,048,482 | 1996 | 21,188,909 | 1995 | 21,300,002 | 1994 | 21,410,142 | 1993 | 21,508,871 | 1992 | 21,478,393 | 1991 | 21,388,515 | 1990 | 21,353,187 | 1989 | 21,281,747 | 1988 | 21,099,829 | 1987 | 21,144,436 | 1986 | 21,282,187 | 1985 | 21,199,425 | 1984 | 21,066,224 | 1983 | 21,014,164 | 1982 | 21,066,192 | 1981 | 21,178,760 | 1980 | 21,260,046 | 1979 | 21,260,524 | 1978 | 21,295,639 | 1977 | 21,357,951 | 1976 | 21,451,007 | 1975 | 21,588,023 | 1974 | 21,713,675 | 1973 | 21,750,209 | 1972 | 21,726,668 | 1971 | 21,667,597 | 1970 | 21,673,217 | 1969 | 21,650,322 | 1968 | 21,528,785 | 1967 | 21,482,504 | 1966 | 21,433,533 | 1965 | 21,304,018 | 1964 | 21,171,231 | 1963 | 21,050,022 | 1962 | 20,903,401 | 1961 | 20,768,071 | 1960 | 20,836,712 |
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