Year	% of output
1990	5.463826791057913
1991	5.83727820726765
1992	9.08992883329739
1993	15.817425003588346
1994	20.307534597642235
1995	14.852071005917159
1996	10.947601748660798
1997	11.01612454823464
1998	8.855593773683903
1999	10.161204064481625
2000	11.51874831400054
2001	9.859351065311238
2002	8.24563432404302
2003	7.504780114722753
2004	6.84193686006826
2005	8.52584113770378
2006	9.017140018216445
2007	8.29992576095026
2008	7.616117655886547
2009	6.617496414669125
2010	19.803764517420905
2011	20.536975977390483
2012	19.496577610951647
2013	20.692928334124346
2014	21.97950377562028