Year	Percent
1985	-0.06845
1988	0.33391
1989	0.56019
1990	0.69319
1991	0.67115
1992	0.69161
1993	2.25193
1994	3.83517
1995	5.39257
1996	8.52871
1997	4.93986
1998	3.53857
1999	3.54835
2000	1.9576
2001	1.35158
2002	0.25318
2003	0.96297
2004	0.7149
2005	1.01332
2006	5.42476
2007	7.66097
2008	4.18394
2009	5.46207
2010	3.91153
2011	3.43737
2012	2.88848
2013	3.57276
2014	6.88281
2015	9.87581
2016	6.31063
2017	4.82422