| Year | Value | | 2022 | 16,464,848 | | 2021 | 16,157,441 | | 2020 | 15,791,050 | | 2019 | 15,371,297 | | 2018 | 14,912,341 | | 2017 | 14,455,615 | | 2016 | 14,004,133 | | 2015 | 13,557,397 | | 2014 | 13,108,362 | | 2013 | 12,649,423 | | 2012 | 12,225,798 | | 2011 | 11,855,805 | | 2010 | 11,510,122 | | 2009 | 11,181,062 | | 2008 | 10,882,938 | | 2007 | 10,588,746 | | 2006 | 10,282,370 | | 2005 | 9,979,111 | | 2004 | 9,684,784 | | 2003 | 9,398,665 | | 2002 | 9,140,816 | | 2001 | 8,876,170 | | 2000 | 8,583,171 | | 1999 | 8,293,298 | | 1998 | 8,004,986 | | 1997 | 7,729,821 | | 1996 | 7,493,507 | | 1995 | 7,274,792 | | 1994 | 7,050,219 | | 1993 | 6,855,366 | | 1992 | 6,660,724 | | 1991 | 6,418,831 | | 1990 | 6,138,676 | | 1989 | 5,832,079 | | 1988 | 5,593,328 | | 1987 | 5,349,096 | | 1986 | 5,104,467 | | 1985 | 4,858,031 | | 1984 | 4,599,141 | | 1983 | 4,345,665 | | 1982 | 4,124,475 | | 1981 | 3,899,227 | | 1980 | 3,712,815 | | 1979 | 3,605,851 | | 1978 | 3,547,990 | | 1977 | 3,522,259 | | 1976 | 3,503,567 | | 1975 | 3,490,062 | | 1974 | 3,480,147 | | 1973 | 3,467,067 | | 1972 | 3,446,068 | | 1971 | 3,417,950 | | 1970 | 3,382,587 | | 1969 | 3,336,527 | | 1968 | 3,277,846 | | 1967 | 3,211,076 | | 1966 | 3,143,158 | | 1965 | 3,075,731 | | 1964 | 3,007,869 | | 1963 | 2,942,834 | | 1962 | 2,880,288 | | 1961 | 2,813,635 | | 1960 | 2,741,624 |
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