Year	% of output
1971	13.64562118126273
1972	13.594040968342643
1973	13.573883161512027
1974	13.553719008264462
1975	13.58609794628752
1976	13.663663663663664
1977	13.537117903930133
1978	13.525179856115107
1979	13.541666666666666
1980	13.636363636363635
1981	12.135922330097088
1982	14.819277108433734
1983	18.492343934040047
1984	21.149674620390453
1985	22.463054187192117
1986	20.680628272251308
1987	25.628930817610062
1988	23.00435413642961
1989	23.724320742213386
1990	19.963144963144963
1991	21.62458836443469
1992	20.64977973568282
1993	28.848167539267017
1994	19.708029197080293
1995	12.785862785862786
1996	9.526159921026652
1997	11.56852527357999
1998	11.767441860465116
1999	22.366710013003903
2000	22.127831715210355
2001	24.236983842010773
2002	16.418966737438076
2003	8.725084618277549
2004	12.01318154583583
2005	15.302390998593529
2006	26.798143851508122
2007	21.91682600382409
2008	18.842560947824104
2009	35.56211769668846
2010	19.833143723928707
2011	22.75672491655213
2012	18.75111826802648
2013	19.188688772933848
2014	17.655571635311144