2017 23.9191780821918
2016 23.9713114754098
2015 23.9682191780822
2014 23.9928767123288
2013 23.8731506849315
2012 24.0035519125683
2011 23.6101369863014
2010 24.0665753424658
2009 23.8315068493151
2008 23.525956284153
2007 23.8947945205479
2006 23.9980662983425
2005 23.9318681318681
2004 23.5325068870523
2003 23.7550684931507
2002 23.7843406593407
2001 23.7214876033058