Year | Value | 2022 | 14,551,496 | 2021 | 15,006,597 | 2020 | 15,364,384 | 2019 | 15,707,971 | 2018 | 15,950,736 | 2017 | 16,089,018 | 2016 | 16,079,862 | 2015 | 15,911,727 | 2014 | 15,711,530 | 2013 | 15,533,718 | 2012 | 15,305,277 | 2011 | 15,006,981 | 2010 | 14,688,538 | 2009 | 14,334,137 | 2008 | 13,937,921 | 2007 | 13,603,710 | 2006 | 13,401,563 | 2005 | 13,277,225 | 2004 | 13,195,215 | 2003 | 13,169,784 | 2002 | 13,285,175 | 2001 | 13,545,128 | 2000 | 13,882,594 | 1999 | 14,275,018 | 1998 | 14,685,317 | 1997 | 15,103,401 | 1996 | 15,575,566 | 1995 | 16,114,581 | 1994 | 16,725,064 | 1993 | 17,393,283 | 1992 | 18,102,140 | 1991 | 18,747,897 | 1990 | 19,215,986 | 1989 | 19,527,887 | 1988 | 19,681,548 | 1987 | 19,615,504 | 1986 | 19,381,964 | 1985 | 19,127,745 | 1984 | 18,875,002 | 1983 | 18,578,410 | 1982 | 18,316,854 | 1981 | 18,152,908 | 1980 | 18,020,323 | 1979 | 17,880,331 | 1978 | 17,741,441 | 1977 | 17,586,119 | 1976 | 17,364,874 | 1975 | 17,094,217 | 1974 | 16,818,928 | 1973 | 16,611,305 | 1972 | 16,429,835 | 1971 | 16,237,844 | 1970 | 16,106,922 | 1969 | 16,111,401 | 1968 | 16,248,542 | 1967 | 16,468,100 | 1966 | 16,795,674 | 1965 | 17,248,954 | 1964 | 17,700,296 | 1963 | 17,982,678 | 1962 | 18,123,995 | 1961 | 18,149,086 | 1960 | 18,083,859 |
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