Year	% of output
1960	16.696914700544465
1961	14.759535655058043
1962	14.97584541062802
1963	15.701219512195122
1964	14.684287812041116
1965	15.634218289085549
1966	15.929203539823009
1967	17.847025495750707
1968	17.28395061728395
1969	15.443592552026287
1970	11.088709677419354
1971	6.001534919416731
1972	5.926025917926566
1973	6.4624624624624625
1974	6.091549295774648
1975	6.6561014263074485
1976	6.832298136645963
1977	6.40774799452162
1978	6.456306265345094
1979	6.678341160550824
1980	6.751453488372093
1981	6.7380025940337225
1982	6.193765600510826
1983	6.39518994260727
1984	5.4748994227741825
1985	5.419704228285774
1986	4.58392101551481
1987	6.050344282650412
1988	7.105319991361313
1989	7.1954614327495685
1990	6.597390552873975
1991	7.481334755447204
1992	7.21367102062509
1993	6.8319027475461
1994	8.396366110377397
1995	9.045844061022942
1996	9.369805326733404
1997	8.16058963183445
1998	8.829721978149506
1999	8.257117093906995
2000	7.698377771370472
2001	8.168132141446359
2002	7.847846729598391
2003	7.1353278763192485
2004	7.117302757164709
2005	7.804595218335399
2006	7.640696334855144
2007	7.310895767428823
2008	8.657684394170689
2009	8.472811198258716
2010	7.668885486885842
2011	7.091169801253835
2012	6.989795508739252
2013	7.091837914056541
2014	6.582039739783251