Year	annual % growth
1971	1.8961739641110142
1972	3.119860360538638
1973	2.188933233625704
1974	-8.149492782932782
1975	-3.411065241892601
1976	13.480942410436356
1977	0.8099394544491219
1978	-6.33703111364305
1979	-20.009283796913678
1980	6.494968560711328
1981	7.611795001914757
1982	16.475505662693195
1983	8.894362269705567
1984	5.789258107851424
1985	4.957834474744004
1986	16.95375243779506
1987	8.14407834195427
1988	-1.797384007122318
1989	1.2229763470913895
1990	0.18286838886034218
1991	17.531702207955348
1992	8.881705486446705
1993	0.36921183571141114
1994	6.125026274110738
1995	5.210472120503113
1996	6.164323295321353
1997	9.231587200096357
1998	-0.8417120401096838
1999	3.9942609451027806
2000	6.762334549324336
2001	8.148008231936402
2002	1.2519775878848662
2003	0.9215120922380322
2004	1.4532625267869719
2005	1.8581009545669787
2006	8.590077366303845
2007	7.376006871112395
2008	3.777367470759714
2009	6.348558921548062
2010	3.7154530407315036
2011	2.472572059469911
2012	5.16599953605305
2013	3.1238743263071598
2014	3.3210487108182605
2015	8.82653611486866
2016	4.795390071632411
2017	-5.631745746680309
2018	3.528524981994366
2019	5.26966920284562
2020	5.925431433050889
2021	1.753859903491147