Population:
| Year | Population | Change | % change |
| 1988 | 15,030 | ||
| 1989 | 14,975 | –55 | –0.4% |
| 1990 | 16,100 | 1,125 | 7.50% |
| 1991 | 16,760 | 660 | 4.10% |
| 1992 | 16,810 | 50 | 0.30% |
| 1993 | 17,315 | 505 | 3.00% |
| 1994 | 17,545 | 230 | 1.30% |
| 1995 | 18,980 | 1,435 | 8.20% |
| 1996 | 20,410 | 1,430 | 7.50% |
| 1997 | 21,895 | 1,485 | 7.30% |
| 1998 | 22,560 | 665 | 3.00% |
| 1999 | 23,405 | 845 | 3.70% |
| 2000 | 24,940 | 1,535 | 6.60% |
| 2001 | 26,200 | 1,260 | 5.10% |
| 2002 | 26,680 | 480 | 1.80% |
| 2003 | 28,100 | 1,420 | 5.30% |
| 2004 | 28,370 | 270 | 1.00% |
| 2005 | 28,964 | 594 | 2.10% |
| 2006 | 29,540 | 576 | 1.90% |
| 2007 | 30,060 | 520 | 1.70% |
| 2008 | 30,405 | 345 | 1.10% |
| 2009 | 30,710 | 305 | 0.99% |