Year	% of total
1992	10.398958952098482
1993	9.338258346332667
1994	10.420146179154205
1995	7.914645423842254
1996	7.87910694727351
1997	6.968497807361454
1998	6.783132682946497
1999	6.961302939886091
2000	6.624057415896646
2001	6.317186150684548
2002	6.944465733307867
2003	7.145991853621556
2004	7.809517031120141
2005	7.889152608172452
2006	8.124147581765206
2007	9.448199037616108
2008	7.742063892176962
2009	7.358290446190812
2010	7.254262498320284
2011	7.230973366280836
2012	6.225985866645379
2013	6.651262757360101
2014	8.045775529130662
2015	8.067010280090878
2016	8.66104930225907