Year	% of output
1960	8.243750809480638
1961	8.2951874304095
1962	8.109360518999074
1963	8.41969637555319
1964	7.66485725774025
1965	7.363170419183598
1966	6.970714498236069
1967	6.9835875331564985
1968	7.380248373743347
1969	7.469247676705357
1970	7.035482123510292
1971	7.283171406283243
1972	7.557476231633535
1973	7.478328373657653
1974	6.8253255500673555
1975	6.755789654481435
1976	6.78360222770856
1977	6.501821688812688
1978	6.696393024922366
1979	6.279075552901958
1980	6.3173076923076925
1981	6.431378118638451
1982	6.267313839232863
1983	6.027828075860097
1984	6.26935170294986
1985	6.296008412966943
1986	6.39197762466744
1987	5.749879246498148
1988	5.865127001599203
1989	5.6332010985657615
1990	5.9071729957805905
1991	6.030170781769993
1992	5.839123730951761
1993	6.170796753031866
1994	5.868242789430254
1995	6.031389321831164
1996	6.05704259528876
1997	5.719673161533627
1998	5.973886603469862
1999	5.542759863809333
2000	5.339546380732872
2001	6.039268344605106
2002	5.218594537607485
2003	5.668106786925314
2004	5.528830632143087
2005	5.32510428458449
2006	5.10387567029509
2007	5.221737405791353
2008	5.00395171163353
2009	5.401411424090717
2010	4.932728825036064
2011	5.310572970195272
2012	4.888662494542279
2013	5.24864446165763
2014	5.329784471565827