Year	% of output
1971	9.174928583431356
1972	7.585877862595419
1973	9.594594594594595
1974	11.654755360087961
1975	10.100200400801604
1976	11.154623547246084
1977	11.04927536231884
1978	11.41031492469192
1979	12.165371329879102
1980	12.97976273551989
1981	12.397693452380953
1982	11.027856135401974
1983	9.46451975285527
1984	9.980447164838901
1985	11.708364296920156
1986	12.032746370095767
1987	13.2514636584321
1988	14.123376623376624
1989	13.804910031325127
1990	13.637022016222481
1991	10.917000414307417
1992	17.53543667123914
1993	18.213128038897892
1994	20.584898525148116
1995	18.644697720515364
1996	16.691755442334415
1997	16.063966122471722
1998	12.888290713324361
1999	12.048319327731093
2000	11.484382846238827
2001	10.761382231206083
2002	10.353454942455533
2003	10.107311114988658
2004	9.725829725829724
2005	9.337621083179732
2006	9.317201549820894
2007	8.486184891918077
2008	8.196114708603146
2009	8.156943727413527
2010	10.125383115073836
2011	5.805267317645259
2012	8.456553829217643
2013	10.490507056497954
2014	10.969689017189346