Year | Value | 2021 | 3,906,386 | 2020 | 3,667,920 | 2019 | 4,963,752 | 2018 | 4,692,008 | 2017 | 4,359,033 | 2016 | 3,952,098 | 2015 | 3,616,026 | 2014 | 3,356,756 | 2013 | 3,073,450 | 2012 | 2,779,741 | 2011 | 2,538,667 | 2010 | 2,377,789 | 2009 | 2,140,124 | 2008 | 1,853,088 | 2007 | 1,753,550 | 2006 | 1,542,564 | 2005 | 1,349,269 | 2004 | 1,209,900 | 2003 | 946,354 | 2002 | 932,064 | 2001 | 840,911 | 2000 | 572,921 | 1999 | 547,800 | 1998 | 510,500 | 1997 | 470,200 | 1996 | 493,000 | 1995 | 397,600 | 1994 | 325,900 | 1993 | 261,600 | 1992 | 200,300 | 1991 | 190,300 | 1990 | 196,000 | 1989 | 159,200 | 1988 | 176,900 | 1987 | 159,700 | 1986 | 127,900 | 1985 | 102,200 | 1984 | 92,500 | 1983 | 74,000 | 1982 | 69,800 | 1981 | 57,300 | 1980 | 51,000 | 1979 | 63,000 | 1978 | 34,000 | 1977 | 28,800 | 1976 | 27,700 | 1975 | 26,600 | 1974 | 21,200 |
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