Year	Percent
1991	36.19239
1992	12.35726
1993	21.0088
1994	12.34197
1995	9.10737
1996	9.97329
1997	8.36479
1998	9.94232
1999	2.99813
2000	1.7663
2001	4.88871
2002	2.71546
2003	1.15607
2004	3.87239
2005	0.07366
2006	0.69092
2007	3.51815
2008	2.05414
2009	2.59872
2010	-1.42545
2011	0.02095
2012	1.45997
2013	1.4319
2014	2.47998
2015	1.1659
2016	1.23592
2017	1.30382