Year	% of total
1985	9.039746746394654
1986	7.381703470031546
1987	6.837862048372649
1988	7.138826185101581
1989	6.436200112422709
1990	7.885304659498208
1991	7.835243109321771
1992	5.360191191532946
1993	8.636715724244771
1994	5.598526703499079
1995	4.299847792998477
1996	4.514154552410099
1997	4.507888805409467
1998	4.336448598130841
1999	3.6945812807881775
2000	2.9871011541072643
2001	3.248259860788863
2002	2.827763496143959
2003	3.154875717017208
2004	3.390856796851347
2005	3.041825095057034
2006	3.216704288939052
2007	4.05295865982167
2008	3.9990002499375157
2009	3.763307749442931
2010	4.150243450034779
2011	5.2028218694885355
2012	5.253322259136213
2013	5.358565737051793
2014	4.501488095238095
2015	4.17195719209142