Year	Percent
1980	-8.62392
1981	-2.36379
1982	-2.53116
1983	-12.72047
1984	-4.56472
1985	-20.34919
1986	-30.04957
1987	-28.47203
1988	-24.60031
1989	-25.504
1990	-25.86021
1991	-15.13298
1992	-9.66683
1993	-9.23602
1994	-8.35717
1995	-8.73279
1996	-7.15929
1997	1.73356
1998	-10.15905
1999	-16.4778
2000	-8.79784
2001	-11.85966
2002	-7.0772
2003	-5.01509
2004	-7.5068
2005	-9.40716
2006	-6.99607
2007	-6.86311
2008	-12.45638
2009	-7.16688
2010	-6.11232
2011	-5.62556
2012	-1.75102
2013	-3.47216
2014	-0.83556