| 1989 | | 1990 | | 1991 | | 1992 | | 1993 | | 1994 | | 1995 | | 1996 | | 1997 | | 1998 | | 1999 | | 2000 | | 2001 | | 2002 | | 2003 | | 2004 | | 2005 | | 2006 | | 2007 | | | 32,034 | | 28,468 | | 20,710 | | 14,339 | | 10,384 | | 6,458 | | 6,402 | | 5,174 | | 5,065 | | 5,756 | | 7,340 | | 6,307 | | 4,972 | | 4,214 | | 3,358 | | 2,742 | | 2,857 | | 2,398 | | 2,263 | | | 23,857 | | 21,732 | | 30,536 | | 33,147 | | 27,277 | | 35,583 | | 34,871 | | 32,343 | | 30,454 | | 21,961 | | 20,110 | | 19,276 | | 24,102 | | 22,904 | | 7,661 | | 26,901 | | 31,087 | | 15,979 | | 19,994 | | | n.a | | n.a | | 42,722 | | 45,598 | | 40,079 | | 37,990 | | 39,433 | | 38,051 | | 34,823 | | 27,201 | | 28,913 | | 26,228 | | 30,417 | | 30,887 | | 18,250 | | 33,914 | | 37,782 | | 22,850 | | 25,563 | | | 2,479 | | 3,143 | | 3,810 | | 4,569 | | 5,196 | | 5,614 | | 6,350 | | 5,996 | | 6,586 | | 5,453 | | 5,723 | | 5,639 | | 4,047 | | 3,896 | | 4,081 | | 4,652 | | 4,133 | | 4,904 | | 6,815 | | | 49,498 | | 52,704 | | 42,425 | | 45,150 | | 35,545 | | 35,317 | | 35,216 | | 34,342 | | 31,785 | | 22,376 | | 24,026 | | 20,614 | | 27,271 | | 27,075 | | 15,164 | | 29,820 | | 32,304 | | 19,267 | | 15,738 | |