Year	% of output
1971	7.618798272025135
1972	6.805850436423685
1973	5.458715596330276
1974	6.355099366673947
1975	5.7351729818780885
1976	6.292828877521475
1977	6.6708678429960395
1978	5.027791814047499
1979	5.677066580894178
1980	4.184134150274105
1981	5.101333127841566
1982	4.7357231874496
1983	3.566701497735981
1984	2.9935219911353563
1985	2.455935717988595
1986	6.349008357240864
1987	5.125304067432256
1988	4.821207110376188
1989	4.576345768346942
1990	4.6942291128337645
1991	4.959561215952403
1992	4.474228444161629
1993	4.170670766865269
1994	3.690543202927104
1995	3.5398520953163515
1996	3.5504595616488888
1997	5.410256410256411
1998	5.669872217099196
1999	3.442560244804284
2000	3.370760179086285
2001	3.0511251166071305
2002	3.054945054945055
2003	3.054781998682001
2004	2.929418980942913
2005	2.8579070820130856
2006	2.719648720281657
2007	2.6528108268887567
2008	2.0964176695554544
2009	3.201352530541012
2010	2.7581027802904883
2011	2.7480353223076794
2012	2.7554243448724662
2013	4.18609960536186
2014	2.8579415585483368