Year | Value | 2022 | 30,658,931 | 2021 | 30,813,832 | 2020 | 30,824,918 | 2019 | 30,810,663 | 2018 | 30,861,811 | 2017 | 30,900,461 | 2016 | 30,849,958 | 2015 | 30,813,332 | 2014 | 30,877,123 | 2013 | 30,972,825 | 2012 | 31,057,365 | 2011 | 31,220,089 | 2010 | 31,451,503 | 2009 | 31,490,783 | 2008 | 31,335,819 | 2007 | 31,112,340 | 2006 | 30,818,530 | 2005 | 30,375,098 | 2004 | 29,931,362 | 2003 | 29,535,188 | 2002 | 29,100,169 | 2001 | 28,677,635 | 2000 | 28,357,751 | 1999 | 28,134,530 | 1998 | 27,882,367 | 1997 | 27,556,354 | 1996 | 27,085,042 | 1995 | 26,019,489 | 1994 | 24,484,419 | 1993 | 23,021,845 | 1992 | 21,786,018 | 1991 | 21,099,755 | 1990 | 21,393,924 | 1989 | 22,369,693 | 1988 | 23,468,297 | 1987 | 24,537,290 | 1986 | 25,151,298 | 1985 | 25,180,221 | 1984 | 24,784,068 | 1983 | 24,076,855 | 1982 | 23,409,221 | 1981 | 23,012,639 | 1980 | 22,989,832 | 1979 | 23,310,840 | 1978 | 23,861,720 | 1977 | 24,289,699 | 1976 | 24,342,060 | 1975 | 23,963,860 | 1974 | 23,218,031 | 1973 | 22,272,528 | 1972 | 21,235,269 | 1971 | 20,281,635 | 1970 | 19,481,590 | 1969 | 18,587,472 | 1968 | 17,448,285 | 1967 | 16,205,872 | 1966 | 15,051,566 | 1965 | 14,255,890 | 1964 | 14,246,978 | 1963 | 14,987,716 | 1962 | 16,088,663 | 1961 | 17,215,898 | 1960 | 18,072,611 |
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