Year	Percent
1991	79.3861
1992	568.8073
1993	1391.16654
1994	4107.29677
1995	161.16392
1996	19.59177
1997	17.73599
1998	10.6985
1999	0.0538
2000	-1.37368
2001	4.06914
2002	2.36979
2003	4.5611
2004	6.30953
2005	3.23984
2006	4.61986
2007	4.23277
2008	5.98956
2009	2.55694
2010	7.76872
2011	4.28155
2012	5.3458
2013	3.36682
2014	2.30918
2015	1.21391
2016	0.26858
2017	2.23157