Year	annual % growth
1971	12.510647038581467
1972	-10.22367983988579
1973	24.664773955730368
1974	6.103110549573259
1975	30.180846726908015
1976	60.7071946503639
1977	-23.149437079007527
1978	-34.84882734368256
1979	-52.850724388769564
1980	204.31714409224202
1981	40.908748867101906
1982	1.413903410805247
1983	-8.338752986723051
1984	-5.250463068612433
1985	-18.46703642694834
1986	-20.59083629926603
1987	-28.37604116879639
1988	33.369579721736926
1989	-14.976567593918617
1990	-15.502229228865033
1991	23.683267054199703
1992	-19.971085766503165
1993	-18.71090981297992
1994	22.322801140210856
1995	-7.434652716537016
1996	10.69579781886101
1997	4.826754824995973
1998	7.288995418343177
1999	-4.7661561126907515
2000	-20.07326496658557
2001	23.93860539078709
2002	8.293201569298716
2003	-1.061432791850919
2004	-3.8271324164542477
2005	9.066525334434928
2006	-5.301764520605104
2007	-2.6344365499296174
2008	3.6423211675764975
2009	0.5789659264715681
2010	0.41848735730118847
2011	11.425422261292113
2012	8.022743815222725
2013	8.845463764854358
2014	12.021310869292407
2015	1.8649893890024742
2016	-1.584575536085751
2017	-1.405963355836846
2018	24.974036593177715
2019	4.218018217170368
2020	-9.64960432386394
2021	1.1655389381209034