| Year | Value | | 2022 | 17,955,170 | | 2021 | 17,400,786 | | 2020 | 16,839,909 | | 2019 | 16,272,338 | | 2018 | 15,720,055 | | 2017 | 15,192,001 | | 2016 | 14,700,170 | | 2015 | 14,253,325 | | 2014 | 13,837,597 | | 2013 | 13,435,431 | | 2012 | 13,045,812 | | 2011 | 12,667,061 | | 2010 | 12,307,066 | | 2009 | 11,962,620 | | 2008 | 11,632,227 | | 2007 | 11,314,475 | | 2006 | 10,991,705 | | 2005 | 10,649,513 | | 2004 | 10,275,228 | | 2003 | 9,883,676 | | 2002 | 9,527,290 | | 2001 | 9,228,489 | | 2000 | 8,980,080 | | 1999 | 8,781,674 | | 1998 | 8,611,919 | | 1997 | 8,423,973 | | 1996 | 8,207,078 | | 1995 | 7,987,148 | | 1994 | 7,781,831 | | 1993 | 7,593,624 | | 1992 | 7,413,828 | | 1991 | 7,251,674 | | 1990 | 7,109,350 | | 1989 | 6,969,968 | | 1988 | 6,836,483 | | 1987 | 6,709,214 | | 1986 | 6,582,253 | | 1985 | 6,459,524 | | 1984 | 6,336,524 | | 1983 | 6,206,627 | | 1982 | 6,076,234 | | 1981 | 5,965,461 | | 1980 | 5,878,271 | | 1979 | 5,786,692 | | 1978 | 5,679,589 | | 1977 | 5,574,944 | | 1976 | 5,479,184 | | 1975 | 5,387,825 | | 1974 | 5,290,180 | | 1973 | 5,183,453 | | 1972 | 5,078,120 | | 1971 | 4,998,759 | | 1970 | 4,919,485 | | 1969 | 4,814,853 | | 1968 | 4,709,121 | | 1967 | 4,605,501 | | 1966 | 4,505,803 | | 1965 | 4,410,083 | | 1964 | 4,316,838 | | 1963 | 4,227,544 | | 1962 | 4,141,793 | | 1961 | 4,057,040 | | 1960 | 3,973,619 |
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