Year	% of total
1992	10.975276695245517
1993	10.384424778761062
1994	10.588765613519472
1995	11.809412577747063
1996	10.912262916939175
1997	11.56282263191354
1998	12.112929032258064
1999	13.108725687458081
2000	13.01356258596974
2001	12.660448634590377
2002	12.097319587628865
2003	13.459935149156937
2004	13.094761298535964
2005	13.35128688010044
2006	12.635524218271
2007	12.84574846625767
2008	11.576670500287522
2009	12.254816484224081
2010	12.50166350411132
2011	10.74689764780674
2012	10.732682926829268
2013	10.850301369863013
2014	10.886841305998482
2015	11.555087319665908
2016	11.582770997846376