| Year | Total | vs prev |
|---|---|---|
| 2016 | 2,572 | −11.3% |
| 2015 | 2,900 | +6.0% |
| 2014 | 2,736 | +23.5% |
| 2013 | 2,215 | +2.8% |
| 2012 | 2,154 | −4.2% |
| 2011 | 2,248 | −0.0% |
| 2010 | 2,249 | +7.6% |
| 2009 | 2,091 | −7.7% |
| 2008 | 2,265 | +20.5% |
| 2007 | 1,879 | +12.6% |
| 2006 | 1,668 | −14.3% |
| 2005 | 1,947 | −1.8% |
| 2004 | 1,982 | +0.8% |
| 2003 | 1,966 | +23.3% |
| 2002 | 1,595 | +0.8% |
| 2001 | 1,583 | +10.6% |
| 2000 | 1,431 | +71.6% |
| 1999 | 834 | +96.2% |
| 1998 | 425 | — |