| Year | Value | | 2022 | 12,881,039 | | 2021 | 12,718,304 | | 2020 | 12,557,553 | | 2019 | 12,386,789 | | 2018 | 12,220,058 | | 2017 | 12,040,180 | | 2016 | 11,896,428 | | 2015 | 11,806,810 | | 2014 | 11,714,867 | | 2013 | 11,607,889 | | 2012 | 11,513,229 | | 2011 | 11,405,693 | | 2010 | 11,257,704 | | 2009 | 11,076,182 | | 2008 | 10,872,002 | | 2007 | 10,634,790 | | 2006 | 10,356,704 | | 2005 | 10,056,177 | | 2004 | 9,744,618 | | 2003 | 9,441,732 | | 2002 | 9,162,284 | | 2001 | 8,859,338 | | 2000 | 8,492,243 | | 1999 | 8,111,611 | | 1998 | 7,746,313 | | 1997 | 7,392,029 | | 1996 | 7,060,670 | | 1995 | 6,760,038 | | 1994 | 6,504,680 | | 1993 | 6,277,890 | | 1992 | 6,099,187 | | 1991 | 5,942,197 | | 1990 | 5,763,316 | | 1989 | 5,593,660 | | 1988 | 5,434,033 | | 1987 | 5,281,980 | | 1986 | 5,141,996 | | 1985 | 5,014,364 | | 1984 | 4,912,348 | | 1983 | 4,822,372 | | 1982 | 4,705,675 | | 1981 | 4,556,823 | | 1980 | 4,381,289 | | 1979 | 4,207,576 | | 1978 | 4,052,037 | | 1977 | 3,901,549 | | 1976 | 3,748,689 | | 1975 | 3,596,319 | | 1974 | 3,448,238 | | 1973 | 3,304,915 | | 1972 | 3,165,454 | | 1971 | 3,032,664 | | 1970 | 2,902,004 | | 1969 | 2,780,490 | | 1968 | 2,686,163 | | 1967 | 2,627,693 | | 1966 | 2,602,778 | | 1965 | 2,601,867 | | 1964 | 2,612,681 | | 1963 | 2,621,765 | | 1962 | 2,615,185 | | 1961 | 2,590,264 | | 1960 | 2,553,188 |
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