Year	% of total
1990	60.62071656734629
1991	65.65978287635505
1992	66.78513697401661
1993	69.793026504215
1994	66.52478398527062
1995	62.242251506269085
1996	59.765917614684234
1997	55.76132435187126
1998	59.603892522681754
1999	62.38864023190549
2000	67.07789802190216
2001	65.16386866196815
2002	59.91134531710861
2003	62.11804433128455
2004	62.563125452103314
2005	57.629131033728754
2006	57.32022666559799
2007	51.74890783307284
2008	53.43548856819396
2009	54.4616907424109
2010	53.08759806673819
2011	50.921249215535006
2012	54.389082525327105
2013	52.19675019633519
2014	52.451994767724436
2015	48.689216294105485
2016	45.06847784442584