Year	% of output
1971	7.942140842789869
1972	7.334022651309303
1973	7.546169479544049
1974	7.395332875772135
1975	7.693673488459022
1976	7.705348594116459
1977	7.615489130434781
1978	8.125201784812537
1979	9.097794404535126
1980	9.163762816889315
1981	9.734056451664298
1982	8.58856692123784
1983	9.140569210393004
1984	8.653206624054471
1985	8.417933235436005
1986	6.598697973664251
1987	7.531488389120304
1988	7.396995769088792
1989	7.659252230717296
1990	8.873203820610534
1991	9.39233725803927
1992	10.323354861232326
1993	9.05081090224769
1994	10.084333348366016
1995	9.14824622605607
1996	10.302807744623767
1997	10.478124503158108
1998	10.81282570669033
1999	11.094453851601793
2000	11.221830339991486
2001	11.315811713006001
2002	10.634286840582659
2003	11.447515651442153
2004	12.960027456945822
2005	11.348420327116836
2006	11.895362754894748
2007	10.459918704604517
2008	11.043004265954238
2009	11.648570493234395
2010	12.04380497406352
2011	11.25204991800328
2012	10.976656902005779
2013	11.587765068631828
2014	11.740747004194485