Year	annual % growth
1971	14.865828619428683
1972	-8.368938964171619
1973	27.268897436380882
1974	8.380203473149479
1975	33.07325513363264
1976	64.41876672809715
1977	-21.306930508283642
1978	-33.23591789745079
1979	-51.65546524182476
1980	212.18984379684207
1981	44.638209423998745
1982	4.141605355962071
1983	-5.8413544710513605
1984	-2.6432381527925912
1985	-16.21059360803244
1986	-18.378829710018252
1987	-26.368415923869676
1988	37.11977757985076
1989	-12.5966417751697
1990	-13.159547264471882
1991	27.076218895500844
1992	-17.79595249888925
1993	-16.521357454412737
1994	25.562996534365
1995	-5.0348000344334025
1996	13.521196461008827
1997	7.48750809625507
1998	10.019494649938167
1999	-2.331294694640775
2000	-18.000894239549652
2001	27.215405670791128
2002	11.202868055565858
2003	1.64502477653528
2004	-1.126138908124858
2005	12.240753661359506
2006	-2.4328687582518427
2007	0.42675821663226543
2008	6.999752052271319
2009	3.9461445569811957
2010	3.914249417018027
2011	15.423402396778869
2012	11.935635361996418
2013	12.728321181443846
2014	15.827286237188474
2015	5.058513556114292
2016	1.2142609646183473
2017	1.1465004589132946
2018	27.998629997773406
2019	6.631992884708865
2020	-7.643899140387404
2021	3.310400709426034