Year	annual % growth
1961	4.81494833001928
1962	28.217321698086
1963	26.1616510452251
1964	4.29808079175619
1965	11.5884757991107
1966	31.9346443961489
1967	10.1265972384583
1968	11.3738840252083
1969	19.1007499701554
1970	7.07211884374308
1971	-2.73395072596219
1972	-6.34788594333442
1973	34.823714529488
1974	-3.5775950001233
1975	2.29544543437873
1976	0.522096429879639
1977	25.3141563394187
1978	18.0351824396126
1979	-4.12331715719696
1980	1.6949678250522
1981	8.39061664611486
1982	-6.407951989117
1983	21.5791667994409
1984	5.23648947273094
1985	-3.5522928582089
1986	-3.94086432582363
1987	18.8797231219449
1988	28.5130441232618
1989	17.3321856751498
1990	31.1312540353553
1991	13.3024174911417
1992	5.30839806751469
1993	8.70807515078995
1994	12.2100893333476
1995	13.3301925926439
1996	5.44640516932427
1997	-23.7835319080785
1998	-48.2193997664787
1999	3.02944055058035
2000	7.46533068846719
2001	1.53887232285305
2002	7.1652568464344
2003	12.2907688731906
2004	15.6463729954599
2005	21.6747531224986
2006	-6.15489235280499
2007	1.33331825829907
2008	9.20499694182777
2009	-25.1248451771192
2010	30.9568171922429
2011	2.76545953403648
2012	11.0228062510255
2013	2.87306697928204
2014	-11.6697079334693
2015	2.28457296512519
2016	-7.16174672871358
2017	14.1339159040952
2018	16.8791737955506