Year	annual %
1961	9.018830525272548
1962	11.181818181818182
1963	20.686835650040884
1964	8.401084010840108
1965	11.75
1966	18.456375838926174
1967	14.258734655335223
1968	15.710743801652892
1969	5.90314977501607
1970	6.009104704097116
1971	14.06304672837739
1972	40.60460706118579
1973	35.070808044745924
1974	43.54919236417034
1975	81.88569616498052
1976	66.5286885706894
1977	53.86257252666346
1978	27.383534101285385
1979	13.697855908357012
1980	17.359847112830064
1981	32.999216146099
1982	20.19607386219097
1983	10.742123285734712
1984	6.023196440294696
1985	1.1418176614341384
1986	9.218621179428435
1987	4.11406911362068
1988	6.416202502567833
1989	0.8733491895829948
1990	4.5820550758316685
1991	14.553911556560415
1992	2.0546915411036646
1993	3.380838051026406
1994	2.985565405389924
1995	3.35659970734372
1996	7.256991920061336
1997	5.210444059034862
1998	3.6310346409727003
1999	6.833958016475767
2000	4.465956135467955
2001	5.087299207063277
2002	15.198385621351257
2003	8.49234471316397
2004	17.251988433396782
2005	13.241010792381141
2006	20.408390648326822
2007	20.141374570062908
2008	17.959669556063698
2009	10.810241726215569
2010	5.172335088191353
2011	13.260447982153082
2012	16.48947816027958
2013	8.351987222167878
2014	11.823261584106145
2015	2.9048048129634028
2016	0.5477072445128036
2017	0.15085308580609633