Year | Value | 2022 | 13,908,141 | 2021 | 14,347,865 | 2020 | 14,711,340 | 2019 | 15,075,114 | 2018 | 15,339,330 | 2017 | 15,498,178 | 2016 | 15,491,924 | 2015 | 15,294,384 | 2014 | 15,040,591 | 2013 | 14,799,740 | 2012 | 14,516,724 | 2011 | 14,180,421 | 2010 | 13,844,090 | 2009 | 13,493,035 | 2008 | 13,112,679 | 2007 | 12,786,601 | 2006 | 12,586,137 | 2005 | 12,456,874 | 2004 | 12,351,967 | 2003 | 12,284,282 | 2002 | 12,353,103 | 2001 | 12,567,863 | 2000 | 12,856,305 | 1999 | 13,195,038 | 1998 | 13,564,783 | 1997 | 13,946,788 | 1996 | 14,374,946 | 1995 | 14,855,099 | 1994 | 15,398,187 | 1993 | 15,989,029 | 1992 | 16,606,228 | 1991 | 17,142,806 | 1990 | 17,490,640 | 1989 | 17,702,102 | 1988 | 17,788,058 | 1987 | 17,685,685 | 1986 | 17,434,559 | 1985 | 17,161,856 | 1984 | 16,886,195 | 1983 | 16,564,700 | 1982 | 16,276,185 | 1981 | 16,080,114 | 1980 | 15,918,796 | 1979 | 15,762,912 | 1978 | 15,639,713 | 1977 | 15,522,785 | 1976 | 15,350,364 | 1975 | 15,142,427 | 1974 | 14,921,116 | 1973 | 14,749,945 | 1972 | 14,606,247 | 1971 | 14,484,681 | 1970 | 14,440,812 | 1969 | 14,533,517 | 1968 | 14,733,787 | 1967 | 14,972,173 | 1966 | 15,277,410 | 1965 | 15,668,519 | 1964 | 16,036,722 | 1963 | 16,208,400 | 1962 | 16,222,945 | 1961 | 16,114,317 | 1960 | 15,923,467 |
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