Year	Percent
1990	-10.03791
1991	-2.97173
1992	0.9928
1993	-7.94408
1994	-10.21522
1995	-9.75689
1996	-10.33675
1997	-13.53763
1998	-14.87896
1999	-9.98197
2000	-14.26647
2001	-13.08079
2002	-18.9314
2003	-15.75659
2004	-19.4618
2005	-16.2258
2006	-16.9687
2007	-17.85947
2008	-25.12112
2009	-21.56591
2010	-18.30156
2011	-18.94327
2012	-21.46611
2013	-18.06428
2014	-17.21222
2015	-16.24319
2016	-14.73765
2017	-13.73454