Year | Value | 2022 | 16,172,363 | 2021 | 16,304,395 | 2020 | 16,368,553 | 2019 | 16,414,711 | 2018 | 16,431,428 | 2017 | 16,353,831 | 2016 | 16,268,927 | 2015 | 16,182,344 | 2014 | 16,051,368 | 2013 | 15,890,158 | 2012 | 15,770,168 | 2011 | 15,687,220 | 2010 | 15,650,575 | 2009 | 15,551,163 | 2008 | 15,418,617 | 2007 | 15,273,488 | 2006 | 15,120,770 | 2005 | 14,980,532 | 2004 | 14,866,687 | 2003 | 14,780,680 | 2002 | 14,673,550 | 2001 | 14,496,158 | 2000 | 14,084,466 | 1999 | 13,543,169 | 1998 | 13,060,275 | 1997 | 12,573,927 | 1996 | 12,190,394 | 1995 | 12,186,352 | 1994 | 12,380,112 | 1993 | 12,484,811 | 1992 | 12,597,256 | 1991 | 12,709,371 | 1990 | 12,710,233 | 1989 | 12,628,253 | 1988 | 12,526,884 | 1987 | 12,463,769 | 1986 | 12,441,545 | 1985 | 12,466,047 | 1984 | 12,518,787 | 1983 | 12,599,058 | 1982 | 12,679,836 | 1981 | 12,713,362 | 1980 | 12,727,517 | 1979 | 12,735,895 | 1978 | 12,755,017 | 1977 | 12,804,704 | 1976 | 12,863,756 | 1975 | 12,867,054 | 1974 | 12,575,701 | 1973 | 11,805,032 | 1972 | 10,796,419 | 1971 | 9,831,068 | 1970 | 9,095,449 | 1969 | 9,011,900 | 1968 | 9,638,492 | 1967 | 10,520,335 | 1966 | 11,344,614 | 1965 | 11,953,811 | 1964 | 12,226,718 | 1963 | 12,245,816 | 1962 | 12,178,805 | 1961 | 12,096,076 | 1960 | 11,977,152 |
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