| Year | Total | vs prev |
|---|---|---|
| 2012 | 798 | +10.7% |
| 2011 | 721 | +32.3% |
| 2010 | 545 | −2.0% |
| 2009 | 556 | −30.2% |
| 2008 | 797 | −32.3% |
| 2007 | 1,178 | +36.2% |
| 2006 | 865 | −6.1% |
| 2005 | 921 | +13.8% |
| 2004 | 809 | +19.7% |
| 2003 | 676 | +18.0% |
| 2002 | 573 | +3.4% |
| 2001 | 554 | −7.4% |
| 2000 | 598 | +14.3% |
| 1999 | 523 | −25.5% |
| 1998 | 702 | — |