Year	% of output
1990	6.396657023465124
1991	4.339296924042687
1992	5.3629293583927415
1993	5.583458898376025
1994	4.156649864288483
1995	5.335708201037714
1996	5.560235888795282
1997	5.214025500910747
1998	5.550699300699301
1999	5.044488010858091
2000	5.952730475631239
2001	5.039402737453339
2002	5.048636799561583
2003	6.193921852387843
2004	5.723266321786393
2005	6.30416087848118
2006	5.709560039695667
2007	5.763478029648341
2008	4.951521434233794
2009	5.444126074498568
2010	6.041218086742541
2011	5.177505497957902
2012	5.627733470542835
2013	5.364033145676514
2014	4.78354600011653