Year	% of total
1990	71.76052487698196
1991	62.72760246644904
1992	47.770114942528735
1993	28.85482416591524
1994	17.648444863336472
1995	16.405362417632357
1996	29.264305177111716
1997	46.48031945236737
1998	49.33348022474386
1999	45.105377191254675
2000	50.69517691053792
2001	50.432412107539015
2002	49.893370421882246
2003	58.83188354340494
2004	51.987743557511
2005	51.2855102364704
2006	54.79750544744159
2007	64.7233536999321
2008	67.16589084530796
2009	59.55450599948941
2010	52.53445456669002
2011	70.71989528795811
2012	69.50007101264025
2013	58.07690103718984
2014	62.815594059405946
2015	63.9772218312112