Year | Value | 2022 | 32,735,575 | 2021 | 32,389,916 | 2020 | 32,010,199 | 2019 | 31,445,428 | 2018 | 31,207,711 | 2017 | 31,114,823 | 2016 | 30,687,717 | 2015 | 29,714,861 | 2014 | 28,559,352 | 2013 | 27,383,170 | 2012 | 26,140,019 | 2011 | 25,035,038 | 2010 | 24,620,912 | 2009 | 24,434,608 | 2008 | 23,994,824 | 2007 | 23,563,265 | 2006 | 23,277,792 | 2005 | 22,928,251 | 2004 | 22,515,328 | 2003 | 22,201,978 | 2002 | 21,941,672 | 2001 | 21,695,344 | 2000 | 21,557,668 | 1999 | 21,589,685 | 1998 | 21,592,330 | 1997 | 21,497,980 | 1996 | 21,303,859 | 1995 | 20,895,327 | 1994 | 20,306,273 | 1993 | 19,813,896 | 1992 | 19,409,178 | 1991 | 18,954,297 | 1990 | 18,608,253 | 1989 | 18,226,731 | 1988 | 17,383,830 | 1987 | 16,344,142 | 1986 | 15,486,984 | 1985 | 14,758,008 | 1984 | 14,448,775 | 1983 | 14,775,764 | 1982 | 15,413,685 | 1981 | 15,977,325 | 1980 | 16,353,901 | 1979 | 16,481,241 | 1978 | 16,394,858 | 1977 | 16,228,637 | 1976 | 15,991,525 | 1975 | 15,736,275 | 1974 | 15,463,903 | 1973 | 15,145,253 | 1972 | 14,864,896 | 1971 | 14,632,970 | 1970 | 14,354,581 | 1969 | 14,066,454 | 1968 | 13,788,720 | 1967 | 13,433,359 | 1966 | 13,005,579 | 1965 | 12,611,012 | 1964 | 12,247,678 | 1963 | 11,902,825 | 1962 | 11,573,405 | 1961 | 11,301,802 | 1960 | 11,077,869 |
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