Year	% of total
1990	1.4870658799594871
1991	1.5453720055621234
1992	1.5878391272761256
1993	1.7631151454594853
1994	1.7865315991507564
1995	1.5796744193349415
1996	1.458889885759865
1997	1.299654716162313
1998	1.1659831035062662
1999	1.4086497058606775
2000	1.3013603554112187
2001	1.3716230666968507
2002	1.3536903719672821
2003	0.8476874399640834
2004	1.7356051236443923
2005	1.7963947205414945
2006	1.794636728510475
2007	2.1041830710911147
2008	1.9947133454202814
2009	1.8980389686823014
2010	2.2063516749124474
2011	2.273240820516223
2012	2.29218680325169
2013	2.1802124500252744
2014	2.1677849463438688
2015	2.5555580818578685
2016	2.5481450126973257