Year	Percent
1987	27.25999
1988	21.65364
1989	22.31557
1990	17.27918
1991	25.81867
1992	26.22021
1993	0.67376
1994	1.428
1995	5.95134
1996	1.54597
1997	1.43413
1998	3.32464
1999	4.22768
2000	6.30012
2001	1.75243
2002	0.43277
2003	15.9107
2004	16.52158
2005	27.39085
2006	100.62651
2007	13.60824
2008	16.70109
2009	1.76588
2010	16.09448
2011	8.99929
2012	11.51426
2013	4.3403
2014	2.60547
2015	2.9828
2016	7.1351
2017	16.72593