Year | Value | 2022 | 18,566,875 | 2021 | 18,457,275 | 2020 | 18,114,608 | 2019 | 17,819,414 | 2018 | 17,452,027 | 2017 | 17,112,116 | 2016 | 16,875,844 | 2015 | 16,642,671 | 2014 | 16,388,061 | 2013 | 16,152,571 | 2012 | 15,934,763 | 2011 | 15,718,524 | 2010 | 15,489,300 | 2009 | 15,270,535 | 2008 | 15,123,408 | 2007 | 15,004,340 | 2006 | 14,847,818 | 2005 | 14,721,073 | 2004 | 14,716,364 | 2003 | 14,824,948 | 2002 | 15,046,918 | 2001 | 15,441,309 | 2000 | 15,921,298 | 1999 | 16,340,267 | 1998 | 16,591,716 | 1997 | 16,717,008 | 1996 | 16,714,748 | 1995 | 16,579,307 | 1994 | 16,440,679 | 1993 | 16,305,520 | 1992 | 16,093,923 | 1991 | 15,836,563 | 1990 | 15,566,803 | 1989 | 15,302,384 | 1988 | 14,925,165 | 1987 | 14,422,392 | 1986 | 13,845,934 | 1985 | 12,912,188 | 1984 | 11,633,580 | 1983 | 10,416,298 | 1982 | 9,512,028 | 1981 | 9,162,405 | 1980 | 9,558,306 | 1979 | 10,521,126 | 1978 | 11,756,357 | 1977 | 12,971,472 | 1976 | 13,663,182 | 1975 | 13,769,806 | 1974 | 13,458,589 | 1973 | 12,814,250 | 1972 | 12,169,297 | 1971 | 11,756,555 | 1970 | 11,746,267 | 1969 | 12,089,568 | 1968 | 12,609,301 | 1967 | 12,997,037 | 1966 | 13,063,986 | 1965 | 12,745,155 | 1964 | 12,073,746 | 1963 | 11,190,568 | 1962 | 10,166,267 | 1961 | 9,165,471 | 1960 | 8,303,182 |
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