Year	annual %
1961	0.2016129032256475
1962	30.583501006036357
1963	6.0606060606064345
1964	11.573849878934212
1965	0.3472222222223712
1966	17.34429065743964
1967	8.182823442683196
1968	19.717206132879202
1969	18.77223439678942
1970	11.530443533894088
1971	12.864969384466615
1972	9.831915177126845
1973	22.409788900828488
1974	34.87851843461517
1975	12.577942936323169
1976	25.087650591175052
1977	38.12551714884175
1978	15.43331138622964
1979	22.546998237419725
1980	21.386632686928813
1981	28.56415494617867
1982	19.01314969234288
1983	26.53697153444494
1984	20.59591737348313
1985	17.398953561780115
1986	-4.267346054269967
1987	-18.327903801470814
1988	2.0414627672445684
1989	2.451950486603577
1990	-0.7096125442984835
1991	1.4786711484247594
1992	-16.720465084088865
1993	-9.228409066355523
1994	26.54093347737718
1995	-6.154587470589426
1996	-10.101226591832486
1997	18.5776472727148
1998	7.773653789408518
1999	13.296899304917117
2000	19.133700165252055
2001	1.3747843509647653
2002	21.173582236974394
2003	1.94742014185132
2004	7.450716034796528
2005	5.6541436945834285
2006	8.127912580107974
2007	14.871853252358827
2008	13.951304112797875
2009	8.231522312772151
2010	13.807833210973655
2011	10.130373106665404
2012	-0.058902576158991055
2013	11.445279440033767
2014	13.24323670217811
2015	8.80292225458133
2016	5.0009874351531165
2017	5.432283213760257
2018	13.937856346299968