Year	Percent
1985	64.81469
1986	51.11546
1987	14.42772
1988	25.84915
1989	55.26652
1990	37.90738
1991	12.97176
1992	5.99384
1993	11.18258
1994	7.7006
1995	19.68536
1996	13.72521
1997	19.35282
1998	84.50446
1999	127.97397
2000	24.79778
2001	8.86807
2002	6.31846
2003	13.45009
2004	10.69043
2005	8.64032
2006	10.8051
2007	7.43829
2008	8.86345
2009	-2.93207
2010	9.19657
2011	10.46872
2012	7.52886
2013	6.47397
2014	5.72656
2015	2.34859
2016	3.02252
2017	1.8518