Show data table
| 1980 | 1,422 | 1991 | 972 | 2002 | 1,305 |
| 1981 | 1,763 | 1992 | 984 | 2003 | 1,209 |
| 1982 | 1,785 | 1993 | 995 | 2004 | 1,361 |
| 1983 | 1,849 | 1994 | 1,061 | 2005 | 1,510 |
| 1984 | 1,840 | 1995 | 1,133 | 2006 | 1,726 |
| 1985 | 1,965 | 1996 | 1,186 | 2007 | 2,016 |
| 1986 | 2,284 | 1997 | 1,081 | 2008 | 2,557 |
| 1987 | 2,823 | 1998 | 1,028 | 2009 | 2,557 |
| 1988 | 1,390 | 1999 | 1,043 | 2010 | 2,807 |
| 1989 | 801 | 2000 | 1,203 | | |
| 1990 | 967 | 2001 | 1,237 | | |
Show data table
| 1980 | 5,616 | 1991 | 23,779 | 2002 | 64,118 |
| 1981 | 6,965 | 1992 | 27,560 | 2003 | 59,836 |
| 1982 | 7,049 | 1993 | 29,842 | 2004 | 68,437 |
| 1983 | 7,268 | 1994 | 35,539 | 2005 | 78,783 |
| 1984 | 7,231 | 1995 | 39,080 | 2006 | 88,099 |
| 1985 | 7,723 | 1996 | 46,139 | 2007 | 100,626 |
| 1986 | 8,976 | 1997 | 48,623 | 2008 | 118,946 |
| 1987 | 11,095 | 1998 | 50,341 | 2009 | 119,509 |
| 1988 | 15,636 | 1999 | 50,905 | 2010 | 130,501 |
| 1989 | 16,986 | 2000 | 57,364 | | |
| 1990 | 21,093 | 2001 | 59,558 | | |
Show data table
| 1980 | 50,854 | 1991 | 50,140 | 2002 | 59,633 |
| 1981 | 53,319 | 1992 | 55,172 | 2003 | 56,747 |
| 1982 | 52,932 | 1993 | 57,634 | 2004 | 58,829 |
| 1983 | 52,047 | 1994 | 59,218 | 2005 | 60,493 |
| 1984 | 47,096 | 1995 | 60,850 | 2006 | 62,006 |
| 1985 | 48,860 | 1996 | 61,136 | 2007 | 63,937 |
| 1986 | 45,044 | 1997 | 59,048 | 2008 | 65,181 |
| 1987 | 44,111 | 1998 | 60,867 | 2009 | 67,363 |
| 1988 | 48,100 | 1999 | 57,542 | 2010 | 68,701 |
| 1989 | 43,717 | 2000 | 57,364 | | |
| 1990 | 46,640 | 2001 | 57,898 | | |