Year	% of output
1971	10.611353711790393
1972	11.28538638102525
1973	9.773913043478261
1974	10.462842242503259
1975	11.134903640256958
1976	9.786526199057388
1977	10.53419870194708
1978	10.48313582497721
1979	9.968911917098445
1980	9.757956927768248
1981	11.068435754189943
1982	10.463791700569569
1983	9.826503140891415
1984	10.041901459326686
1985	9.775357385976854
1986	9.067490984028852
1987	8.798900137482816
1988	9.294300979519145
1989	9.419326241134751
1990	8.527212297465725
1991	5.008147745790331
1992	3.21020681140035
1993	4.238143289606458
1994	9.075850043591979
1995	5.731061859080384
1996	6.268942415058223
1997	8.776576178915619
1998	1.4959901295496607
1999	14.03644823575029
2000	8.403949311980098
2001	8.626877575435332
2002	5.375779455201838
2003	4.053564965617083
2004	4.574978819542502
2005	6.365992742353551
2006	6.519331453886427
2007	7.372970799618033
2008	10.369649805447471
2009	11.07590446914164
2010	11.312943562014194
2011	10.693433575941775
2012	11.757819645143588
2013	13.024816043860914
2014	14.704654560634523