1980 3,012

1981 3,042

1982 2,993

1983 2,830

1984 2,871

1985 2,919

1986 2,933

1987 2,689

1988 2,896

1989 2,834

1990 2,852

1991 2,930

1992 2,969

1993 2,964

1994 3,028

1995 3,038

1996 3,038

1997 3,119

1998 3,173

1999 2,979

2000 2,967

2001 3,041

2002 3,120

2003 3,150

2004 3,351

2005 3,484

2006 3,574

2007 3,588

2008 3,742

2009 3,702

2010 3,762

2011 3,988

2012 4,124

2013 4,240