Year	% of output
1960	8.72842039908249
1961	8.903248189427122
1962	8.648431214802896
1963	8.592752074680462
1964	8.425454545454546
1965	7.654055963533351
1966	7.87440631936608
1967	8.098023098348344
1968	8.036431527453837
1969	7.42692811527755
1970	7.7107755164382
1971	7.6886666997245685
1972	8.026344123155932
1973	9.55343026721613
1974	8.54628502901081
1975	9.928901400317597
1976	9.851116625310173
1977	7.756206020631875
1978	8.611372762877398
1979	8.071621508729915
1980	8.636190721124738
1981	7.189981047994673
1982	7.747277003425851
1983	7.468307873378614
1984	7.024782041600878
1985	7.5651328806645335
1986	7.16661187931984
1987	6.964864342022537
1988	7.712548286210209
1989	8.233327326966585
1990	7.076161571318622
1991	7.169478091731715
1992	7.060442570236354
1993	6.891717423047938
1994	6.5864276291991875
1995	7.081543914786476
1996	7.617174204831663
1997	6.962343096234309
1998	6.9084072080605505
1999	7.4471668293188475
2000	7.805698848737443
2001	7.522296449523551
2002	8.20965536514527
2003	6.499112870669095
2004	6.288081485000792
2005	8.311846117152601
2006	8.526922472704422
2007	7.465348204215326
2008	8.346548160527707
2009	8.709330840079062
2010	8.559491004477888
2011	8.800575809102938
2012	8.438532257076483
2013	8.46695578320769
2014	8.711767382817177