Year	Percent
1983	5.9001
1984	4.07503
1985	-3.38361
1986	2.32828
1987	9.62305
1988	3.57766
1989	1.23145
1990	4.51419
1991	0.77981
1992	10.5818
1993	2.94616
1994	2.15273
1995	1.22614
1996	-2.41264
1997	-2.26522
1998	-6.49798
1999	-4.40347
2000	3.43089
2001	0.51583
2002	6.32219
2003	8.92335
2004	23.71578
2005	5.57249
2006	10.84268
2007	12.0618
2008	1.27787
2009	-0.7939
2010	22.54473
2011	18.91124
2012	6.69485
2013	8.62991
2014	-3.37248
2015	-23.18116
2016	-2.68094
2017	7.27365