Year	% of output
1971	9.987007362494586
1972	9.31820768676253
1973	9.20783396667641
1974	8.851720810550017
1975	8.732196344519837
1976	8.842929976668492
1977	8.992410223402258
1978	9.629610129781241
1979	9.926886259139218
1980	9.865546624182297
1981	10.215810732833237
1982	10.00586408357405
1983	10.14286312790649
1984	9.711189112630088
1985	9.939898289412852
1986	9.964576352321686
1987	9.896258305163771
1988	11.222071460877432
1989	11.322038629979236
1990	13.200841872821998
1991	13.083680073971337
1992	15.036283948843225
1993	14.371848278886208
1994	16.603454815019138
1995	16.0932095394138
1996	17.160730669780634
1997	18.102582976445397
1998	17.80494245196564
1999	16.57310611485035
2000	18.161341016238868
2001	18.01225523171194
2002	16.813182902089192
2003	16.544245429478416
2004	16.7348617696088
2005	15.713898400393626
2006	15.96362430729882
2007	17.48526162337603
2008	18.51093259562696
2009	19.476093677935122
2010	15.724380201912773
2011	16.892079083238887
2012	15.836343852013057
2013	15.722041459660248
2014	16.898002963286157