Year	% of output
1971	7.072666386077918
1972	6.366141335394334
1973	6.718434539524772
1974	6.952700956319463
1975	7.170133789088578
1976	7.176340129539555
1977	7.273134718573758
1978	8.009846619958342
1979	7.662566296741989
1980	7.634081515093329
1981	7.07397761666784
1982	7.267334386448425
1983	7.738478558808475
1984	6.187342895164868
1985	6.091212584167939
1986	4.195116622057136
1987	5.304816101036527
1988	4.9662494098431775
1989	5.402907836372598
1990	6.031381322369018
1991	6.59111655616412
1992	7.215888988168413
1993	7.359786803260249
1994	7.7875153324860005
1995	6.2207022294625665
1996	7.666319124192967
1997	7.746661917460072
1998	8.146673630477842
1999	8.388300685553482
2000	8.204987562368588
2001	7.806487873067113
2002	6.323090719423144
2003	8.272936414585207
2004	10.00498069978832
2005	8.493937328293157
2006	8.717924186070615
2007	8.451823416506718
2008	8.791909799271288
2009	9.837327553025546
2010	9.53368037155949
2011	8.474589330292478
2012	8.717091713643478
2013	8.486840026541124
2014	8.393761198696442