Year	annual %
1977	15.6365217842167
1978	16.4830693049293
1979	19.6096605730897
1980	4.22610021946809
1981	-1.05140397943869
1982	7.28603418655803
1983	-1.4160557429492
1984	5.31693301209593
1985	1.58797484563028
1986	-9.63850181477753
1987	1.96996323615168
1988	-8.04452556075518
1989	-8.36935717645076
1990	-13.4624088920027
1991	-17.8883090275404
1992	21.0459676650265
1993	-6.40638940570486
1994	-2.81967262138035
1995	-3.97750523668722
1996	4.98024225341985
1997	3.11177111139484
1998	4.99623867453684
1999	0.7423001516498
2000	12.228443940203
2001	3.24632615544944
2002	-2.87738456949192
2003	-1.23813440688325
2004	7.67850451683631
2005	10.8375522855422
2006	1.53808827051223
2007	5.04815432640568
2008	3.37587467356492
2009	-7.50325992491003
2010	-12.8243063125074
2011	1.72464400842446
2012	4.19168558224416
2013	3.38853603403737
2014	-5.21857408140835
2015	0.171055809329502
2016	-2.7546695058996
2017	1.5279629562306
2018	-2.96121585408585