Year	% of output
1971	28.04878048780488
1972	21.69811320754717
1973	18.852459016393443
1974	23.841059602649008
1975	23.737373737373737
1976	29.292929292929294
1977	22.48803827751196
1978	23.6734693877551
1979	28.92857142857143
1980	25.796178343949045
1981	25.268817204301076
1982	26.410256410256412
1983	27.00729927007299
1984	26.77725118483412
1985	26.75736961451247
1986	20.767494356659142
1987	29.1497975708502
1988	31.401869158878505
1989	32
1990	30.65326633165829
1991	30.982905982905983
1992	30.260047281323878
1993	41.48351648351649
1994	49.46619217081851
1995	52.72727272727272
1996	55.867768595041326
1997	44.132231404958674
1998	54.44947209653092
1999	53.29512893982808
2000	44.60694698354662
2001	48.98989898989899
2002	51.005484460694696
2003	52.149532710280376
2004	53.199268738574034
2005	38.30935251798561
2006	38.24561403508772
2007	48.29059829059829
2008	52.88065843621399
2009	51.17891816920943
2010	58.43270868824531
2011	66.48992576882291
2012	56.99999999999999
2013	56.77725118483412
2014	60.1161665053243