Year	annual % growth
1961	1.88696514750602
1962	4.67570595440606
1963	-1.23871527936275
1964	3.8511661580368
1965	7.67647673591334
1966	8.9305864849549
1967	-0.331236420999105
1968	8.33644487997451
1969	0.136148357242448
1970	3.60445645947638
1971	0.143968340057214
1972	-14.4115451595578
1973	21.4476295318611
1974	7.21474533394593
1975	-2.45791422343086
1976	7.52852263806028
1977	-3.34720919750302
1978	10.274368092228
1979	12.5884864447516
1980	-1.34854411478076
1981	7.49300748613922
1982	-2.41104504747925
1983	-13.5742861281714
1984	-0.168720081613429
1985	1.69791298195953
1986	8.94685990338171
1987	5.38843561546629
1988	-2.27203877612844
1989	1.58090514569145
1990	1.96656833824966
1991	1.13058221549731
1992	1.52566335480084
1993	0.926255734787034
1994	4.49892502696076
1995	0.187317733166708
1996	5.01747068398073
1997	2.25024080636655
1998	3.31131042321803
1999	5.99659504386707
2000	-1.38433929460999
2001	-2.73811841038086
2002	-4.89530326833342
2003	2.2313030630549
2004	-2.67252489207549
2005	1.3407378419507
2006	2.07486452985803
2007	4.65370293178754
2008	9.29993638131165
2009	5.15596256190685
2010	3.10797192056025
2011	3.66025805644095
2012	5.96285895814792
2013	4.92289746059767
2014	2.48369617435702
2015	2.15021905620904
2016	2.86852059716769
2017	-0.734696637669572
2018	0.753560201181088