| Year | Value | | 2022 | 22,741,667 | | 2021 | 21,835,020 | | 2020 | 21,330,638 | | 2019 | 21,000,250 | | 2018 | 20,782,663 | | 2017 | 20,675,358 | | 2016 | 20,431,885 | | 2015 | 20,035,406 | | 2014 | 19,619,027 | | 2013 | 19,153,618 | | 2012 | 18,579,131 | | 2011 | 17,954,895 | | 2010 | 17,410,447 | | 2009 | 16,945,088 | | 2008 | 16,477,090 | | 2007 | 16,017,821 | | 2006 | 15,561,455 | | 2005 | 15,034,311 | | 2004 | 14,477,599 | | 2003 | 13,869,577 | | 2002 | 13,181,487 | | 2001 | 12,544,752 | | 2000 | 11,934,167 | | 1999 | 11,284,817 | | 1998 | 10,671,331 | | 1997 | 10,156,557 | | 1996 | 9,703,608 | | 1995 | 9,306,217 | | 1994 | 9,016,099 | | 1993 | 8,818,345 | | 1992 | 8,639,615 | | 1991 | 8,453,310 | | 1990 | 8,253,301 | | 1989 | 7,987,875 | | 1988 | 7,673,645 | | 1987 | 7,383,074 | | 1986 | 7,129,866 | | 1985 | 6,884,921 | | 1984 | 6,630,229 | | 1983 | 6,390,224 | | 1982 | 6,170,213 | | 1981 | 5,943,486 | | 1980 | 5,705,577 | | 1979 | 5,447,080 | | 1978 | 5,160,243 | | 1977 | 4,880,666 | | 1976 | 4,632,572 | | 1975 | 4,415,843 | | 1974 | 4,236,219 | | 1973 | 4,076,747 | | 1972 | 3,920,441 | | 1971 | 3,762,428 | | 1970 | 3,609,980 | | 1969 | 3,480,500 | | 1968 | 3,372,969 | | 1967 | 3,279,891 | | 1966 | 3,207,924 | | 1965 | 3,158,711 | | 1964 | 3,111,260 | | 1963 | 3,042,536 | | 1962 | 2,972,833 | | 1961 | 2,945,786 | | 1960 | 2,986,062 |
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