Year	annual %
1961	15.555555555555555
1962	18.108974358974358
1963	9.226594301221166
1964	7.204968944099378
1965	6.60486674391657
1966	-1.956521739130435
1967	5.210643015521065
1968	12.62381454162276
1969	18.581586826347305
1970	8.568723370680132
1971	14.193313953488374
1972	27.83045885572456
1973	32.07209001294434
1974	67.12153196622437
1975	61.187801687192675
1976	86.67944753082101
1977	-0.043477283119570026
1978	-14.778206906895647
1979	8.087892360897227
1980	24.550191321031495
1981	15.85776383325934
1982	13.462156901473568
1983	17.928853440547478
1984	15.720056332802052
1985	12.072772587485971
1986	-10.06382141707605
1987	-12.979036450331316
1988	0.2056331006979063
1989	5.88313330431358
1990	3.671017908741377
1991	8.291726779010657
1992	-15.7911256656797
1993	-1.7178971083998045
1994	37.36589271417134
1995	10.11617170220533
1996	17.22113884555382
1997	11.27556876920554
1998	-1.8446378000179402
1999	-2.9950933994799653
2000	18.27800457583778
2001	4.173280460907972
2002	4.709154889835121
2003	-1.7738763971688911
2004	9.71365256700261
2005	32.672321725298374
2006	14.32330552785817
2007	7.502137906680906
2008	10.830064163133654
2009	3.3931608289850153
2010	20.721929520089382
2011	27.065020705636655
2012	9.974192059484912
2013	10.896797754102934
2014	-2.6355469299875156
2015	0.35627928010348975
2016	-4.0033593170270425
2017	-17.410061889189908
2018	33.232986398651185
2019	1.3637975449944977