| 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 | 126.7 |
| 2000 | 90.3 |
| 2001 | 125.5 |
| 2002 | 187.0 |
| 2003 | 143.1 |
| 2004 | 154.4 |
| 2005 | 155.0 |
| 2006 | 136.6 |
| 2007 | 163.0 |
| 2008 | 194.1 |
| 2009 | 278.4 |
| 2010 | 332.6 |
| 2011 | 281.1 |
| 2012 | 244.5 |
| 2013 | 290.2 |
| 2014 | 255.3 |