| Year | |
|---|---|
| 1991 | 0.0 |
| 1992 | 0.0 |
| 1993 | 0.0 |
| 1994 | 0.0 |
| 1995 | 0.0 |
| 1996 | 0.0 |
| 1997 | 0.0 |
| 1998 | 0.0 |
| 1999 | 145.8 |
| 2000 | 143.5 |
| 2001 | 195.5 |
| 2002 | 301.3 |
| 2003 | 138.4 |
| 2004 | 330.0 |
| 2005 | 342.7 |
| 2006 | 316.8 |
| 2007 | 562.1 |
| 2008 | 251.2 |
| 2009 | 220.4 |
| 2010 | 241.5 |
| 2011 | 280.5 |
| 2012 | 336.0 |
| 2013 | 308.4 |
| 2014 | 263.4 |