Year	% of total
1992	53.209277808715015
1993	54.082595129375946
1994	51.09822070392378
1995	53.93819461490295
1996	53.846447950073674
1997	43.529217060167554
1998	47.345310549969284
1999	47.23812775978804
2000	49.27353991525993
2001	47.211633671602065
2002	47.0638951766796
2003	47.06259092147897
2004	45.5264843393892
2005	47.66069699739345
2006	49.82941412546465
2007	47.02580348561543
2008	47.459374439982746
2009	48.51445796504023
2010	50.17527276775774
2011	49.05543735891648
2012	57.61880702513614
2013	55.469177215189866
2014	49.49624342409831
2015	53.88974170901661
2016	52.67178583850931