Year	% of output
1971	5
1972	5
1973	5.001420858198352
1974	5.006485084306096
1975	5.0077898953928335
1976	5.000954380606986
1977	4.996857322438718
1978	5.003190810465858
1979	5
1980	4.998682245453747
1981	4.6236360273719255
1982	4.998536299765808
1983	4.998455359901143
1984	5.000256950511331
1985	5.001668812282459
1986	4.998429577780769
1987	5.233229675699689
1988	5.11727078891258
1989	5.029337803855825
1990	5
1991	5.766458433445458
1992	4.679841897233201
1993	4.44106463878327
1994	4.114285714285714
1995	3.8193860740342265
1996	4.773476249126194
1997	3.8860872144764165
1998	5.768298594280175
1999	7.613344739093241
2000	8.589341692789969
2001	6.871104771945056
2002	6.86885391134867
2003	5.8821453775582215
2004	6.1216906641895035
2005	30
2006	28.267746799515127
2007	40.93329722899179
2008	48.85599653003687
2009	48.68285465162364
2010	35.90005725034759
2011	38.506205591525514
2012	43.0201225607371
2013	39.85656088459827
2014	50.63156652107189