2017 9.83890410958904
2016 9.32814207650273
2015 6.74191780821918
2014 7.13369863013699
2013 8.84821917808219
2012 7.10437158469945
2011 9.0186301369863
2010 8.7441095890411
2009 6.30246575342466
2008 8.30874316939891
2007 6.99835616438356
2006 7.84876712328767
2005 8.28328767123288
2004 9.48934426229508
2003 6.4986301369863
2002 6.56712328767123
2001 6.36301369863014