Year	annual %
1961	2.785406041584935
1962	11.221374045801527
1963	5.284831846259437
1964	25.4367666232073
1965	13.332813636836088
1966	6.2340937750773815
1967	1.8345059783312472
1968	11.213546965072906
1969	15.26250595521677
1970	5.768467693935586
1971	1.8054491738702265
1972	16.063751381894118
1973	29.886228337081626
1974	15.564111182408002
1975	9.633181153161411
1976	12.778956846099426
1977	17.747776003649633
1978	12.688121269356966
1979	13.239141529452848
1980	4.203255388089511
1981	11.009383152211027
1982	10.297296078021253
1983	14.456066245505486
1984	9.737603836045443
1985	17.127454550298854
1986	11.390990936342083
1987	5.631770263708437
1988	11.075453135538972
1989	15.572990597454234
1990	19.87413427573663
1991	15.92659336425677
1992	15.218124239906562
1993	8.78209797517962
1994	23.17488555912733
1995	9.030010105775657
1996	9.04520467012558
1997	19.825046531015385
1998	-1.0934242347628986
1999	13.705356494560897
2000	13.073874936875995
2001	9.675750659750621
2002	15.9341278120192
2003	12.437923800967459
2004	19.264471745145638
2005	18.591896416289455
2006	19.99365997700181
2007	22.21259981515115
2008	23.389689818504095