Year	%
1978	-3.932755937493765
1979	-10.506056012159465
1980	-2.0247464344692343
1981	2.1849684311917477
1982	3.166989828786094
1983	-4.745323585540976
1984	-3.202506282366192
1985	-15.966610133261053
1986	-29.998268949461146
1987	-25.193713197198203
1988	-11.971349544098302
1989	-34.54680202115901
1990	-34.539040836916875
1991	-25.77388955419149
1992	-41.790243978186055
1993	-12.455969337128826
1994	-5.63447019509948
1995	11.424913920025956
1996	23.67048575767097
1997	16.976629973953823
1998	12.739308500618307
1999	19.15879542694729
2000	4.664768070187698
2001	16.677463489596313
2002	21.615624281608685
2003	19.525341474206744
2004	9.196933646909338
2005	9.909085184292733
2006	7.517820242055237
2007	5.240870634219009
2008	7.613795381170082
2009	15.633633461981391
2010	6.112942211695312
2011	6.956559539784619
2012	4.821477450168979
2013	-0.19143004643656175
2014	5.816367851223573
2015	6.179215852481581
2016	1.6939292791977762
2017	2.091490484117101
2018	2.2158652901341216
2019	2.4696743253059434
2020	-3.8930324559827745