| Year | Value | | 2020 | 8,019,060 | | 2019 | 8,519,412 | | 2018 | 8,364,868 | | 2017 | 8,305,504 | | 2016 | 8,042,980 | | 2015 | 7,645,865 | | 2014 | 7,213,267 | | 2013 | 7,088,863 | | 2012 | 7,012,139 | | 2011 | 6,803,755 | | 2010 | 6,740,237 | | 2009 | 6,705,194 | | 2008 | 6,747,269 | | 2007 | 6,583,447 | | 2006 | 6,573,775 | | 2005 | 6,302,130 | | 2004 | 6,213,934 | | 2003 | 5,867,129 | | 2002 | 5,767,431 | | 2001 | 5,667,598 | | 2000 | 5,568,321 | | 1999 | 5,460,043 | | 1998 | 5,350,900 | | 1997 | 5,025,474 | | 1996 | 4,882,094 | | 1995 | 4,745,537 | | 1994 | 4,602,265 | | 1993 | 4,452,114 | | 1992 | 4,313,570 | | 1991 | 4,177,910 | | 1990 | 4,037,947 |
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