Year	Percent
1991	83.54951
1992	1065.32923
1993	747.56698
1994	1385.20203
1995	545.69531
1996	26.42101
1997	9.24021
1998	-0.96393
1999	2.16101
2000	12.49337
2001	2.51501
2002	3.11932
2003	6.00861
2004	8.31518
2005	16.13942
2006	11.30122
2007	20.9819
2008	27.76195
2009	-18.92973
2010	13.75655
2011	22.56609
2012	2.84794
2013	0.45752
2014	-0.55866
2015	-8.85512
2016	14.6714
2017	15.95334