| Year | Total | vs prev |
|---|---|---|
| 2016 | 1,153 | +18.0% |
| 2015 | 977 | +9.0% |
| 2014 | 896 | −9.1% |
| 2013 | 986 | −4.0% |
| 2012 | 1,027 | −3.1% |
| 2011 | 1,060 | +8.5% |
| 2010 | 977 | −23.9% |
| 2009 | 1,283 | −0.8% |
| 2008 | 1,293 | −17.7% |
| 2007 | 1,572 | −3.6% |
| 2006 | 1,630 | −3.9% |
| 2005 | 1,696 | +2.3% |
| 2004 | 1,658 | +22.2% |
| 2003 | 1,357 | −0.2% |
| 2002 | 1,360 | +21.2% |
| 2001 | 1,122 | +37.7% |
| 2000 | 815 | −13.0% |
| 1999 | 937 | +39.2% |
| 1998 | 673 | — |