| Year | Value | | 2022 | 5,947,000 | | 2021 | 5,846,000 | | 2020 | 6,236,000 | | 2019 | 6,011,000 | | 2018 | 6,319,000 | | 2017 | 6,400,000 | | 2016 | 6,100,000 | | 2015 | 5,600,000 | | 2014 | 5,100,000 | | 2013 | 4,766,000 | | 2012 | 4,922,000 | | 2011 | 4,820,000 | | 2010 | 4,710,000 | | 2009 | 4,700,000 | | 2008 | 4,620,000 | | 2007 | 4,251,207 | | 2006 | 3,802,290 | | 2005 | 3,530,000 | | 2004 | 3,027,000 | | 2003 | 2,599,000 | | 2002 | 2,449,000 | | 2001 | 2,288,000 | | 2000 | 1,542,000 | | 1999 | 1,395,000 | | 1998 | 790,000 | | 1997 | 566,200 | | 1996 | 492,800 | | 1995 | 365,000 | | 1994 | 239,200 | | 1993 | 143,800 | | 1992 | 100,200 | | 1991 | 72,300 | | 1990 | 54,100 | | 1989 | 28,900 | | 1988 | 10,000 | | 1987 | 2,400 |
|