Year	annual %
1966	23.041738136077758
1967	14.866790582403965
1968	18.509129156665498
1969	10.206636020208457
1970	16.538294752927087
1971	29.578637748954566
1972	20.175306649892654
1973	13.373462444386286
1974	46.36175679473283
1975	26.328782340960988
1976	64.92585113774535
1977	19.079231024938043
1978	19.470041624977195
1979	2.550405441358489
1980	26.66371887048271
1981	35.4936496034453
1982	-41.773710998706534
1983	93.68917244041694
1984	-3.519077990377084
1985	9.126679230694887
1986	-2.0078445091203765
1987	9.408475208152106
1988	4.042331517030805
1989	4.449289846456775
1990	-11.56314434214152
1991	23.208514551924498
1992	4.8603614052283595
1993	5.72781962640605
1994	5.98352313038499
1995	7.424578642304239
1996	3.1019619736768473
1997	7.848517560311745
1998	16.756756756756758
1999	4.124095359727543
2000	10.221290949046864
2001	9.240970000463673
2002	10.338455008488964
2003	6.357003108970931
2004	4.147240120437828
2005	21.991229519116235
2006	14.893575945489971
2007	39.29978443469858
2008	19.67982924226254
2009	5.809702158016765
2010	10.509460199738738
2011	3.4013346043851285
2012	4.052808201497216
2013	8.202202060296758
2014	6.511556812350558
2015	2.9460304443647174