Year	% of output
1971	6.7826899813043005
1972	5.394274741655929
1973	4.748142031379025
1974	8.801576263328698
1975	8.059597455781127
1976	7.96823487942939
1977	7.45399851545103
1978	7.345569738190627
1979	7.764053932759664
1980	7.41036159222121
1981	7.5984097653844005
1982	7.658242904459531
1983	7.493248133307444
1984	7.66062319040397
1985	7.391476402677173
1986	7.25010725010725
1987	7.220721589812849
1988	7.013398824882644
1989	7.0089511906772515
1990	6.417112299465241
1991	6.323592822315831
1992	6.53605838427282
1993	8.171650697309646
1994	7.980955316926133
1995	7.871234007428807
1996	8.07545869044075
1997	7.9231356182942205
1998	7.664335231492944
1999	7.670007325550585
2000	6.797328249509676
2001	6.614219899237546
2002	6.392525824067373
2003	6.1425328438949
2004	6.067549826948323
2005	6.135650730492732
2006	5.839529490520477
2007	5.60024611458001
2008	5.596974608319827
2009	5.496618972951783
2010	5.234902475618905
2011	5.076288374665807
2012	4.830020649001581
2013	4.764673053669426
2014	4.520776534737238