Year	annual % growth
1971	7.848517713397669
1972	1.4136895920119628
1973	9.899602032842196
1974	-6.853516099882853
1975	3.0019587027643126
1976	-18.364305519423112
1977	-14.80285219897894
1978	-13.461762003948792
1979	-2.8005658185393827
1980	43.69509941332632
1981	56.94513967249975
1982	49.267531160558974
1983	-15.412621112909491
1984	-3.113746928268853
1985	-20.378153578889467
1986	-23.524321625788986
1987	-16.55669159495082
1988	-34.72495161483218
1989	-25.979121043684003
1990	1.7641664824297436
1991	51.170367616931856
1992	3.770216691713003
1993	-30.063232785040412
1994	13.506836812555605
1995	-91.28017691482697
1996	30.835764314347614
1997	234.46006650718482
1998	62.50176121195946
1999	-21.459656953106148
2000	-95.58755668626092
2001	1432.8926702874817
2002	37.396390940698524
2003	91.22797899059373
2004	-30.71372740769756
2005	36.53317365903524
2006	24.359171332559157
2007	5.534897521427354
2008	18.074914748262216
2009	20.956618276477172
2010	32.603670578280486
2011	-28.561480659588938
2012	61.653193508505495
2013	23.601745780981403
2014	10.264481591344165
2015	-17.80995824731916
2016	-21.9890282985897
2017	-32.09840970518266
2018	10.492298957430052
2019	-14.132027457853766
2020	-20.256551968823345
2021	32.559928628515564