2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 |
0.398 | 0.398 | 0.410 | 0.421 | 0.429 | 0.440 | 0.480 | 0.477 | 0.475 | 0.540 | 0.569 | 0.579 |