Year	% of output
1960	9.59903381642512
1961	9.29784304726939
1962	9.875793799028763
1963	9.923228778240842
1964	9.921787709497206
1965	9.097035040431267
1966	8.575156024117627
1967	8.181581685744016
1968	8.160541649034862
1969	9.00349947338022
1970	8.07740970784449
1971	7.658509990058048
1972	8.29386116252078
1973	7.944699459488823
1974	8.277181823082314
1975	7.371041671513995
1976	8.531921968521392
1977	6.868598823273044
1978	7.410650887573965
1979	6.9328054547454085
1980	6.6382978723404245
1981	6.200563336805957
1982	6.08478708006399
1983	6.240061308554459
1984	6.7561295530218946
1985	6.2012712245890125
1986	6.1636688420792
1987	6.039629220171784
1988	5.983779617279399
1989	6.080113118383598
1990	7.404713412860052
1991	7.318402362703044
1992	7.372410481547538
1993	7.065395990798554
1994	6.750229287679608
1995	7.2002313327335825
1996	7.589198414250413
1997	6.925087108013937
1998	6.938559322033898
1999	7.0391565826452895
2000	6.177787187707943
2001	5.905035323257057
2002	6.354540594210648
2003	6.406727828746177
2004	6.64526736083927
2005	7.321462562079288
2006	6.748100939873824
2007	6.354701304956427
2008	6.383137418700399
2009	6.2769036941490555
2010	6.619027432931629
2011	7.1349065004452354
2012	6.722923393014383
2013	6.805878928987194
2014	6.698810304984167