Year | Value | 2022 | 31,003,695 | 2021 | 31,321,029 | 2020 | 31,523,132 | 2019 | 31,586,098 | 2018 | 31,466,066 | 2017 | 31,271,286 | 2016 | 31,006,494 | 2015 | 30,615,284 | 2014 | 30,225,227 | 2013 | 29,844,975 | 2012 | 29,401,395 | 2011 | 28,954,587 | 2010 | 28,592,457 | 2009 | 28,255,821 | 2008 | 27,897,559 | 2007 | 27,459,913 | 2006 | 26,886,954 | 2005 | 25,725,290 | 2004 | 24,088,157 | 2003 | 22,548,640 | 2002 | 21,296,937 | 2001 | 20,651,902 | 2000 | 21,039,021 | 1999 | 22,116,115 | 1998 | 23,333,553 | 1997 | 24,500,634 | 1996 | 25,146,670 | 1995 | 25,142,029 | 1994 | 24,652,641 | 1993 | 23,835,080 | 1992 | 23,114,589 | 1991 | 22,721,568 | 1990 | 22,730,195 | 1989 | 23,143,694 | 1988 | 23,786,818 | 1987 | 24,312,121 | 1986 | 24,625,376 | 1985 | 24,741,784 | 1984 | 24,638,103 | 1983 | 24,402,556 | 1982 | 24,050,474 | 1981 | 23,576,424 | 1980 | 22,967,339 | 1979 | 22,066,212 | 1978 | 20,759,668 | 1977 | 19,195,380 | 1976 | 17,739,070 | 1975 | 16,832,088 | 1974 | 16,943,231 | 1973 | 17,910,598 | 1972 | 19,306,629 | 1971 | 20,769,581 | 1970 | 21,775,974 | 1969 | 22,075,355 | 1968 | 21,927,964 | 1967 | 21,642,553 | 1966 | 21,322,675 | 1965 | 20,963,047 | 1964 | 20,535,033 | 1963 | 20,186,279 | 1962 | 19,879,597 | 1961 | 19,539,533 | 1960 | 19,319,261 |
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