Year	Percent
1986	28.07242
1987	30.70375
1988	31.07456
1989	29.78597
1990	33.44178
1991	30.58558
1992	26.07328
1993	28.08385
1994	25.86251
1995	24.52537
1996	24.34507
1997	22.85398
1998	26.92397
1999	26.03353
2000	28.95785
2001	30.01825
2002	28.97042
2003	25.1854
2004	25.81624
2005	35.11107
2006	45.56199
2007	47.57008
2008	42.54379
2009	47.29956
2010	43.20536
2011	53.35243
2012	53.53693
2013	53.95582
2014	49.50873
2015	49.07622
2016	81.54844
2017	103.86556