Year	% of total
2006	74.58825334821428
2007	76.11570559147964
2008	69.16954625121713
2009	66.91281708094327
2010	66.1097385340763
2011	67.51581381617792
2012	66.31259185918591
2013	67.84943228602384
2014	63.651619318181815
2015	67.74530779450842
2016	67.24155060553633