Year | Value | 2022 | 20,537,534 | 2021 | 20,798,288 | 2020 | 21,059,632 | 2019 | 21,302,584 | 2018 | 21,491,720 | 2017 | 21,638,370 | 2016 | 21,759,588 | 2015 | 21,790,716 | 2014 | 21,725,586 | 2013 | 21,737,046 | 2012 | 21,840,291 | 2011 | 21,986,776 | 2010 | 22,140,316 | 2009 | 22,263,360 | 2008 | 22,392,904 | 2007 | 22,517,374 | 2006 | 22,637,894 | 2005 | 22,768,637 | 2004 | 22,880,823 | 2003 | 22,987,716 | 2002 | 23,249,400 | 2001 | 23,497,551 | 2000 | 23,568,449 | 1999 | 23,650,626 | 1998 | 23,742,187 | 1997 | 23,834,449 | 1996 | 23,969,777 | 1995 | 24,174,448 | 1994 | 24,366,211 | 1993 | 24,787,150 | 1992 | 25,142,268 | 1991 | 25,014,367 | 1990 | 24,365,078 | 1989 | 23,714,192 | 1988 | 23,316,413 | 1987 | 22,886,703 | 1986 | 22,435,034 | 1985 | 22,028,394 | 1984 | 21,601,854 | 1983 | 21,170,417 | 1982 | 20,750,640 | 1981 | 20,062,459 | 1980 | 19,378,590 | 1979 | 18,992,787 | 1978 | 18,641,117 | 1977 | 18,320,624 | 1976 | 18,048,791 | 1975 | 17,825,895 | 1974 | 17,596,128 | 1973 | 17,374,648 | 1972 | 17,159,382 | 1971 | 16,946,535 | 1970 | 16,725,013 | 1969 | 16,497,475 | 1968 | 16,276,489 | 1967 | 16,057,109 | 1966 | 15,810,183 | 1965 | 15,523,453 | 1964 | 15,233,480 | 1963 | 14,951,411 | 1962 | 14,681,754 | 1961 | 14,423,674 | 1960 | 14,173,292 |
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