| Year | Total | vs prev |
|---|---|---|
| 2016 | 4,335 | +19.5% |
| 2015 | 3,629 | −22.4% |
| 2014 | 4,676 | +45.3% |
| 2013 | 3,218 | +10626.7% |
| 2012 | 30 | — |
| 2011 | 0 | −100.0% |
| 2010 | 24 | −95.4% |
| 2009 | 523 | −31.8% |
| 2008 | 767 | −29.5% |
| 2007 | 1,088 | −2.1% |
| 2006 | 1,111 | −6.7% |
| 2005 | 1,191 | +38.2% |
| 2004 | 862 | −6.2% |
| 2003 | 919 | −25.5% |
| 2002 | 1,234 | −0.7% |
| 2001 | 1,243 | +24.8% |
| 2000 | 996 | −24.1% |
| 1999 | 1,312 | +521.8% |
| 1998 | 211 | — |