Year	% of output
1971	12.15435305119045
1972	12.06179282254661
1973	11.909025569808378
1974	11.72407636773452
1975	11.848385635986029
1976	11.86682870787957
1977	11.959720414309219
1978	11.896292161772278
1979	12.122652721654385
1980	12.348681773631538
1981	12.062160594215717
1982	12.696329234862894
1983	12.21871326809511
1984	11.776294102565444
1985	12.394969816449729
1986	12.950039506195393
1987	13.649631554065483
1988	13.660628517959879
1989	14.684688627781778
1990	14.265780717838663
1991	14.68823559987822
1992	14.65423182360495
1993	15.274182526041127
1994	15.586538336307159
1995	15.801015786200308
1996	15.965136804942631
1997	16.049750802230992
1998	15.409118608387347
1999	15.661313735474506
2000	15.40196009019247
2001	15.128529133025266
2002	15.254446449781726
2003	14.314504192011439
2004	15.310544569620552
2005	15.308462620365805
2006	15.482415859770242
2007	15.309887520899833
2008	15.181693149989824
2009	15.47309839780268
2010	15.28449470420371
2011	14.794204920049602
2012	14.870836581104161
2013	14.761357487926434
2014	14.290373298525813