Year	% of total
1992	6.908393608074012
1993	4.443635371179039
1994	6.542354586129753
1995	8.224202094886014
1996	8.544259151656014
1997	8.497504456327986
1998	8.344341943419433
1999	8.685
2000	10.219102564102563
2001	10.648449967298887
2002	9.179838492597577
2003	9.26010101010101
2004	10.48952718676123
2005	10.688276869158878
2006	11.654090623033355
2007	9.273722921914358
2008	9.64366867140514
2009	8.039946524064172
2010	6.817356991525424
2011	6.379157894736842
2012	7.452008343265792
2013	6.630792079207922
2014	5.597216610549944
2015	5.821392322706571
2016	6.256159744408945