Year	%
1985	39.9655239888964
1986	26.3591384058586
1987	32.6655350973518
1988	21.2134249729057
1989	36.009133634171
1990	48.8691791893508
1991	28.5754178909029
1992	23.9705261388324
1993	24.3458278419054
1994	20.3396521773457
1995	18.1595558966592
1996	17.3678567329936
1997	15.670265400513
1998	20.1695011436128
1999	12.6231518368615
2000	14.8433912347788
2001	11.8910098561076
2002	7.75807289652374
2003	6.17877873086097
2004	5.12700362788107
2005	6.67787900981346
2006	7.99948207856606
2007	8.67125848644778
2008	13.261771366415
2009	7.25063476884463
2010	4.75482680518703
2011	9.03015252269429
2012	10.0572624433615
2013	9.26187678192101
2014	8.09805824839012
2015	5.51492732291402
2016	5.58839657725206
2017	4.55285507889072
2018	4.17801925025561