Year | Value | 2022 | 31,825,973 | 2021 | 31,213,082 | 2020 | 30,999,405 | 2019 | 30,638,234 | 2018 | 30,175,056 | 2017 | 29,729,549 | 2016 | 29,357,013 | 2015 | 29,011,826 | 2014 | 28,781,576 | 2013 | 28,479,640 | 2012 | 28,166,078 | 2011 | 27,847,821 | 2010 | 27,522,537 | 2009 | 27,158,023 | 2008 | 26,789,863 | 2007 | 26,441,461 | 2006 | 26,126,316 | 2005 | 25,834,340 | 2004 | 25,566,897 | 2003 | 25,304,780 | 2002 | 25,052,940 | 2001 | 24,757,782 | 2000 | 24,388,404 | 1999 | 24,048,329 | 1998 | 23,739,358 | 1997 | 23,428,320 | 1996 | 23,081,461 | 1995 | 22,760,570 | 1994 | 22,450,573 | 1993 | 22,130,869 | 1992 | 21,813,814 | 1991 | 21,482,271 | 1990 | 21,206,427 | 1989 | 20,883,649 | 1988 | 20,506,939 | 1987 | 20,237,468 | 1986 | 19,967,235 | 1985 | 19,731,489 | 1984 | 19,511,294 | 1983 | 19,287,381 | 1982 | 19,057,229 | 1981 | 18,791,654 | 1980 | 18,549,289 | 1979 | 18,301,934 | 1978 | 18,112,108 | 1977 | 17,923,214 | 1976 | 17,705,309 | 1975 | 17,498,862 | 1974 | 17,272,703 | 1973 | 17,060,238 | 1972 | 16,879,589 | 1971 | 16,710,910 | 1970 | 16,132,459 | 1969 | 15,804,855 | 1968 | 15,487,885 | 1967 | 15,136,519 | 1966 | 14,763,748 | 1965 | 14,343,688 | 1964 | 13,934,678 | 1963 | 13,522,659 | 1962 | 13,121,753 | 1961 | 12,729,040 | 1960 | 12,368,380 |
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