| Year | Total | vs prev |
|---|---|---|
| 2012 | 1,351 | +11.2% |
| 2011 | 1,215 | +20.4% |
| 2010 | 1,009 | +13.9% |
| 2009 | 886 | −20.8% |
| 2008 | 1,119 | −19.1% |
| 2007 | 1,383 | +21.5% |
| 2006 | 1,138 | +0.1% |
| 2005 | 1,137 | −2.3% |
| 2004 | 1,164 | +1.7% |
| 2003 | 1,144 | +33.3% |
| 2002 | 858 | +1488.9% |
| 2001 | 54 | −67.1% |
| 2000 | 164 | −67.6% |
| 1999 | 506 | −24.5% |
| 1998 | 670 | — |