Year	% of total
1990	1.6790412695723238
1991	1.654179143463012
1992	1.3661937876795405
1993	1.4335901103496163
1994	1.51728704007543
1995	1.4216446820585935
1996	1.6440667599558247
1997	1.4515260377242338
1998	1.5985249418400882
1999	1.5323350660039972
2000	1.7032392180077278
2001	1.8666127028216368
2002	1.9243308727767725
2003	1.8079504030399614
2004	1.7693046204333034
2005	1.7328678689147443
2006	1.7479102329476353
2007	1.6748848426675713
2008	1.5512811664874602
2009	1.300755199461845
2010	1.4215577348792237
2011	1.0716777697569486
2012	1.2175667494076283
2013	1.286031440214913
2014	1.5195663663566703
2015	1.4500010736296132
2016	1.4081813465784503