Year	% of output
1990	6.9349097381134
1991	6.761226307085612
1992	7.977373268547392
1993	15.576704793503884
1994	16.413234507526553
1995	24.200210010500527
1996	29.02282408290419
1997	28.813440672033604
1998	30.67041348855881
1999	25.59603820304209
2000	25.39012792177349
2001	34.19916587400307
2002	37.14141922496225
2003	29.38449468654162
2004	30.21596988309887
2005	34.483916459606476
2006	32.100805618673824
2007	30.903573836817262
2008	31.300364746797865
2009	24.884958946133718
2010	24.09090909090909
2011	22.357830848396887
2012	22.158491561181435
2013	20.276925272999787
2014	23.730441943453197