Year	annual % growth
1977	32.973099038819
1978	-3.39637048288606
1979	11.6329196658685
1980	36.5747666125932
1981	28.7315600452144
1982	-14.7389077810572
1983	-14.0425633557086
1984	1.84250581103396
1985	-29.4157190455512
1986	5.09538942167738
1987	26.4681472624587
1988	1.38182536906936
1989	0.630120295601117
1990	13.3533298327246
1991	-27.1021893944803
1992	54.5292669116737
1993	15.2358530650904
1994	-1.01477253897384
1995	3.13237767057215
1996	-7.81213121072881
1997	-11.8853730223295
1998	-12.0539389406836
1999	2.753287852727
2000	6.2400625003073
2001	-1.50570191813102
2002	0.201137050715047
2003	3.94679699282045
2004	37.0594151375257
2005	32.6304020107698
2006	-9.54862002155249
2007	14.9240888348842
2008	16.5891738697198
2009	0.12969841414268
2010	-2.32998879900752
2011	-11.0183837228414
2012	-3.86960511413272
2013	-9.27679899543669
2014	0.0976744081809358
2015	3.43936633750188
2016	-6.62297574529802
2017	6.8931016578274
2018	-8.76709877218073