Year	% of output
1990	17.839951865222623
1991	20.570517363571934
1992	26.421491914449664
1993	29.96941896024465
1994	28.91891891891892
1995	31.967831113345063
1996	46.57709532949456
1997	29.427430093209058
1998	20.59686044505779
1999	27.00729927007299
2000	23.984526112185687
2001	23.130841121495326
2002	24.9811320754717
2003	22.69182389937107
2004	18.87396033269354
2005	17.040358744394617
2006	16.72459619709671
2007	16.72605323831482
2008	15.130830489192265
2009	13.305799964086908
2010	10.94009355666214
2011	10.108303249097473
2012	9.064374898654126
2013	9.260750523433725
2014	9.044932892433378