Year | Value | 2022 | 30,196,848 | 2021 | 30,100,691 | 2020 | 29,734,420 | 2019 | 29,351,183 | 2018 | 28,969,907 | 2017 | 28,526,743 | 2016 | 28,079,443 | 2015 | 27,673,858 | 2014 | 27,330,456 | 2013 | 26,959,737 | 2012 | 26,518,351 | 2011 | 25,969,887 | 2010 | 24,901,029 | 2009 | 23,336,844 | 2008 | 21,859,365 | 2007 | 20,636,456 | 2006 | 19,975,295 | 2005 | 20,301,261 | 2004 | 21,296,907 | 2003 | 22,425,310 | 2002 | 23,506,269 | 2001 | 24,102,842 | 2000 | 24,085,604 | 1999 | 23,604,858 | 1998 | 22,816,278 | 1997 | 22,120,915 | 1996 | 21,737,566 | 1995 | 21,758,498 | 1994 | 22,160,131 | 1993 | 22,783,985 | 1992 | 23,287,901 | 1991 | 23,570,328 | 1990 | 23,658,405 | 1989 | 23,563,647 | 1988 | 23,318,314 | 1987 | 22,940,376 | 1986 | 22,460,089 | 1985 | 21,862,353 | 1984 | 21,014,546 | 1983 | 19,778,785 | 1982 | 18,307,281 | 1981 | 16,946,610 | 1980 | 16,082,066 | 1979 | 16,173,298 | 1978 | 17,068,160 | 1977 | 18,401,539 | 1976 | 19,799,530 | 1975 | 20,736,220 | 1974 | 21,040,270 | 1973 | 20,929,154 | 1972 | 20,678,445 | 1971 | 20,360,360 | 1970 | 20,059,861 | 1969 | 19,718,595 | 1968 | 19,365,338 | 1967 | 19,046,624 | 1966 | 18,705,057 | 1965 | 18,435,442 | 1964 | 18,087,452 | 1963 | 17,576,093 | 1962 | 17,024,263 | 1961 | 16,540,330 | 1960 | 15,995,500 |
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