Year	annual % growth
1981	4.10000018627746
1982	-4.21404868258725
1983	-17.6999981318659
1984	12.9999976646143
1985	-6.59999848956096
1986	14.9999933824147
1987	15.3000015860626
1988	9.90000319100932
1989	5.89999516783399
1990	11.513637182787
1991	-3.43713266634094
1992	-6.90678883442585
1993	4.06031364405605
1994	26.686948532747
1995	9.40757075918835
1996	4.26619334221839
1997	16.308262546537
1998	-0.744489648742913
1999	16.8241832034269
2000	56.3892243683402
2001	-24.3466997801171
2002	33.601497820817
2003	-7.78843841880231
2004	-5.60814034937799
2005	10.1573578095386
2006	6.2098183009909
2007	5.80219034756986
2008	55.9687499541863
2009	7.24403029229651
2010	17.5596945992455
2011	17.1107099974102
2012	73.7857844860526
2013	53.1654563462944
2014	23.9944170505532
2015	-22.7672812749712
2016	-23.1414338917576
2017	13.8759585929835
2018	11.7587341895645