Year	annual % growth
1977	16.5390581948059
1978	10.4491862382722
1979	12.5383356002458
1980	18.3859954988137
1981	19.7916039280922
1982	-2.29771256988377
1983	-4.86097515111223
1984	10.5800306644921
1985	4.22111031801482
1986	-13.7500988075342
1987	22.8677718830503
1988	21.3857594367459
1989	-2.35992630274488
1990	6.16672158436285
1991	-5.05643709796949
1992	5.24260601236699
1993	6.20896900221817
1994	4.00959052019714
1995	8.21171310593635
1996	0.970401375531438
1997	-2.76797314557945
1998	1.37453607602041
1999	0.898845028394277
2000	2.35729326766707
2001	5.01770548883734
2002	18.484713516726
2003	4.88499226112349
2004	15.3738000785181
2005	3.35355264650073
2006	12.4012346224502
2007	2.42546075887556
2008	-10.8340638094881
2009	-13.7629837400394
2010	-2.4687863313199
2011	-3.44852999109006
2012	1.08540380358129
2013	-6.11232729771683
2014	4.1597437763339
2015	-7.57041714203181
2016	-6.61684540592456
2017	5.30134372926341
2018	5.28642873290784