Year	annual % growth
1971	11.181271593125715
1972	4.5906156161131975
1973	13.362095739139377
1974	-3.922391499549221
1975	5.91255205702555
1976	-16.330465507572043
1977	-12.717555092899232
1978	-11.380905546148597
1979	-0.5190696963192494
1980	46.99277312521383
1981	60.48719346171211
1982	52.546798070388235
1983	-13.63306989300959
1984	-0.6373994031542196
1985	-17.959115826242254
1986	-21.214057624033728
1987	-14.051620874407206
1988	-32.79585698422842
1989	-23.816279509459733
1990	4.671529802604482
1991	55.43151726827949
1992	6.659201863560199
1993	-28.03223078984368
1994	16.790708603609957
1995	-91.04140935371466
1996	34.379954844246214
1997	241.39983427884272
1998	66.01339320916082
1999	-19.33399994569602
2000	-95.41587905077847
2001	1491.620875127285
2002	40.64993276276164
2003	96.59513956830443
2004	-28.31913328743127
2005	41.53617459062443
2006	29.115838811172637
2007	9.492632954525789
2008	22.05238934990561
2009	25.914488506501826
2010	38.23065890276581
2011	-26.205911786648358
2012	66.20356586084034
2013	26.612528522378412
2014	12.931872660037328
2015	-15.82329679404694
2016	-20.103013418764718
2017	-30.45525851913041
2018	13.169610595314339
2019	-12.085628084438667
2020	-18.37501168450781
2021	35.666506642880904