Year | Value | 2022 | 13,344,216 | 2021 | 14,103,929 | 2020 | 14,615,719 | 2019 | 15,195,390 | 2018 | 15,772,574 | 2017 | 16,329,909 | 2016 | 16,750,501 | 2015 | 16,951,372 | 2014 | 16,980,104 | 2013 | 16,925,355 | 2012 | 16,721,630 | 2011 | 16,365,430 | 2010 | 16,031,061 | 2009 | 15,733,270 | 2008 | 15,384,315 | 2007 | 15,057,189 | 2006 | 14,859,678 | 2005 | 14,677,693 | 2004 | 14,492,195 | 2003 | 14,321,984 | 2002 | 14,182,566 | 2001 | 14,055,651 | 2000 | 13,914,201 | 1999 | 13,778,290 | 1998 | 13,689,805 | 1997 | 13,556,923 | 1996 | 13,392,151 | 1995 | 13,333,797 | 1994 | 13,418,055 | 1993 | 13,643,535 | 1992 | 14,006,940 | 1991 | 14,458,126 | 1990 | 14,882,602 | 1989 | 15,220,442 | 1988 | 15,364,460 | 1987 | 15,343,381 | 1986 | 15,173,443 | 1985 | 14,874,736 | 1984 | 14,567,231 | 1983 | 14,280,277 | 1982 | 13,960,204 | 1981 | 13,650,156 | 1980 | 13,375,427 | 1979 | 13,098,488 | 1978 | 12,756,301 | 1977 | 12,377,514 | 1976 | 11,954,777 | 1975 | 11,170,054 | 1974 | 10,040,959 | 1973 | 8,935,202 | 1972 | 8,102,439 | 1971 | 7,801,158 | 1970 | 8,215,018 | 1969 | 9,186,598 | 1968 | 10,427,994 | 1967 | 11,614,349 | 1966 | 12,257,556 | 1965 | 12,322,541 | 1964 | 11,955,836 | 1963 | 11,266,551 | 1962 | 10,599,670 | 1961 | 10,182,044 | 1960 | 10,162,158 |
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