Year	Percent
1990	8.55467
1991	3.06647
1992	5.12001
1993	-3.30261
1994	0.91803
1995	6.7603
1996	4.7619
1997	4.94028
1998	-1.51468
1999	5.63946
2000	17.83491
2001	9.90795
2002	10.67584
2003	24.02142
2004	31.38259
2005	36.5728
2006	45.25998
2007	43.17387
2008	43.52544
2009	16.41394
2010	23.50749
2011	10.0379
2012	34.87609
2013	5.60576
2014	-44.86896
2015	-32.63337