Year	annual %
1973	4.124310194597734
1974	82.8966849050531
1975	38.41551402527013
1976	39.50366151342555
1977	25.496378924856618
1978	11.646664116926562
1979	6.766284787567104
1980	31.998879042149643
1981	38.672020430454914
1982	26.665276209198762
1983	23.417631715857752
1984	9.857313786187838
1985	21.05379436513812
1986	-6.779585040983606
1987	5.272726856399653
1988	5.938931496957015
1989	9.411456729288574
1990	9.969252479646306
1991	5.451836860413625
1992	3.088863069250213
1993	3.246526960207205
1994	6.734505847366405
1995	7.677340045325892
1996	8.072504643323931
1997	24.498498064743572
1998	4.770198768933389
1999	6.393284550289626
2000	6.0240560027766765
2001	10.804050827519537
2002	5.554986190712696
2003	2.422397359660853
2004	4.080875816702965
2005	21.654062392823636
2006	24.44983537431159
2007	34.67018899930939
2008	23.266197765856493
2009	4.734999080074412
2010	11.342093861885537
2011	12.181146406553708
2012	10.727015497411058
2013	8.485305980606206
2014	12.029358302555519
2015	14.210084356508718
2016	1.830874477608218
2017	4.181722141600611