Year	% of output
1971	9.16518213649487
1972	10.032109451347202
1973	10.785314250155569
1974	10.496340401496788
1975	11.690266237069697
1976	12.286689419795222
1977	12.203348147627663
1978	11.167447532250819
1979	13.003816690577375
1980	14.438953092291875
1981	14.870981014518309
1982	15.281311846197342
1983	15.345776477911606
1984	15.384615384615385
1985	15.947481704692208
1986	15.970386907204649
1987	15.472994406232834
1988	15.487766908745991
1989	15.59567349947549
1990	17.70002615630339
1991	18.236581495869125
1992	18.578875315922495
1993	17.787524879682383
1994	19.51365235641663
1995	19.737289262548206
1996	20.702617015823595
1997	20.747921287948312
1998	20.741933232116992
1999	20.914655614896134
2000	21.489688372130217
2001	21.617789064697877
2002	20.991836587909518
2003	20.54054054054054
2004	20.47526592655283
2005	22.185805167347638
2006	21.819380951520518
2007	22.487186451887194
2008	24.880869700792314
2009	25.96328661075597
2010	21.535639727956564
2011	21.292574002475078
2012	24.126543955834276
2013	25.01705636397306
2014	32.23692929368082