Year | Value | 2022 | 18,722,832 | 2021 | 18,305,394 | 2020 | 17,962,248 | 2019 | 17,660,637 | 2018 | 17,398,521 | 2017 | 17,206,396 | 2016 | 17,080,308 | 2015 | 16,979,659 | 2014 | 16,946,628 | 2013 | 17,064,540 | 2012 | 17,314,215 | 2011 | 17,619,119 | 2010 | 17,888,129 | 2009 | 18,074,851 | 2008 | 18,194,422 | 2007 | 18,240,706 | 2006 | 18,227,553 | 2005 | 18,165,849 | 2004 | 18,042,286 | 2003 | 17,847,341 | 2002 | 17,607,789 | 2001 | 17,284,858 | 2000 | 16,866,162 | 1999 | 16,410,513 | 1998 | 15,916,659 | 1997 | 15,368,598 | 1996 | 14,805,380 | 1995 | 14,278,624 | 1994 | 13,781,077 | 1993 | 13,343,861 | 1992 | 12,961,255 | 1991 | 12,590,540 | 1990 | 12,217,041 | 1989 | 11,760,445 | 1988 | 11,463,690 | 1987 | 11,189,696 | 1986 | 10,915,804 | 1985 | 10,638,417 | 1984 | 10,357,895 | 1983 | 10,073,439 | 1982 | 9,798,324 | 1981 | 9,468,770 | 1980 | 9,116,202 | 1979 | 8,810,854 | 1978 | 8,532,376 | 1977 | 8,255,054 | 1976 | 7,982,779 | 1975 | 7,751,207 | 1974 | 7,538,525 | 1973 | 7,333,789 | 1972 | 7,135,069 | 1971 | 6,916,512 | 1970 | 6,674,361 | 1969 | 6,430,002 | 1968 | 6,174,386 | 1967 | 5,905,491 | 1966 | 5,641,359 | 1965 | 5,386,650 | 1964 | 5,128,093 | 1963 | 4,881,552 | 1962 | 4,666,844 | 1961 | 4,480,502 | 1960 | 4,327,217 |
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