Year	% of total
2005	52.576075727003854
2006	57.39371306457301
2007	53.9609430399682
2008	60.74167314589551
2009	52.38013370599418
2010	62.08344070219661
2011	63.24611022480574
2012	61.200102038607106
2013	63.86902391300584
2014	64.66469700201148