Year	% of output
2000	23.03009807237065
2001	23.021390374331553
2002	23.014804845222073
2003	23.002754820936637
2004	23.00342969132778
2005	22.94751009421265
2006	20.139828597203426
2007	18.676318510858327
2008	18.461836497481595
2009	19.37299035369775
2010	17.976006191950464
2011	16.22134114807792
2012	15.63183577317853
2013	13.47126436781609
2014	15.047829286239883