Year	Percent
1981	5.66111
1982	7.34804
1983	2.36688
1984	3.75964
1985	2.27073
1986	3.03459
1987	2.19348
1988	2.79024
1989	3.45846
1990	4.60362
1991	5.4091
1992	2.12464
1993	2.32202
1994	1.18439
1995	0.73776
1996	0.16223
1997	-0.41092
1998	-0.1171
1999	0.11513
2000	1.5013
2001	1.01851
2002	-0.25362
2003	1.12692
2004	0.34344
2005	0.69019
2006	2.09578
2007	2.41466
2008	2.02727
2009	0.36185
2010	0.31719
2011	0.34229
2012	-0.17402
2013	0.0253
2014	-0.62541
2015	-0.60077
2016	-0.56614
2017	0.35355