Year	% of output
1990	7.527279452561494
1991	7.775119617224881
1992	9.254399506020377
1993	18.32514861721375
1994	20.025308446694083
1995	23.593442622950818
1996	23.08843537414966
1997	24.72484886064176
1998	24.4031007751938
1999	24.284532671629446
2000	25.49054584373885
2001	26.122517108996828
2002	27.80942516830658
2003	30.631385027633563
2004	29.11088225197391
2005	29.532554257095157
2006	30.170715692711752
2007	28.71655943108703
2008	28.87744935237463
2009	23.475314617618587
2010	23.556355308359233
2011	21.05081230556516
2012	21.664943123061015
2013	25.22823424627032
2014	21.528686226873482