Year	% of total
1990	0.42996963286426937
1991	0.41294948149263666
1992	0.3006084091249943
1993	0.2313187315496348
1994	0.2882213960582038
1995	0.2693900516595663
1996	0.22027331772696224
1997	0.20007384114715407
1998	0.22885534199147126
1999	0.21462027703776296
2000	0.16701502531709367
2001	0.16527824756155146
2002	0.4736617064552892
2003	0.4161755875999659
2004	0.49467399679119006
2005	0.4180329597235277
2006	0.49206173706341333
2007	0.6976082575847977
2008	0.6296531412046877
2009	0.7610927206272818
2010	0.6687267013111291
2011	0.8099136420755955
2012	0.7436312815629385
2013	0.678391987482715
2014	0.9236731141085701
2015	1.0116241905984613
2016	1.24907895748485