Year	% of output
1971	13.282937365010799
1972	12.39356669820246
1973	12.128922815945717
1974	14.714714714714713
1975	13.707386363636365
1976	13.174404015056462
1977	10.365853658536585
1978	11.959654178674352
1979	11.070707070707071
1980	12.209302325581394
1981	12.563291139240507
1982	12.84316819185863
1983	12.869614193185019
1984	13.324742268041238
1985	12.95287710158655
1986	11.796127309147563
1987	10.845896147403684
1988	10.861207227989235
1989	10.579763663220088
1990	10.342453966615041
1991	10.364842454394694
1992	10.001541069502235
1993	10.430188679245283
1994	10.130533484676505
1995	9.896987873255965
1996	10.066860098397882
1997	10.338323706236
1998	10.599889928453495
1999	10.403120936280883
2000	10.541713854284636
2001	11.077949438202248
2002	10.62410269402922
2003	12.302922940655447
2004	12.922948073701843
2005	13.482347365926861
2006	13.54413903988975
2007	13.610888710968775
2008	13.743646870430966
2009	12.339365329137163
2010	11.446371854385538
2011	13.669151967024307
2012	15.154199656718898
2013	14.727163919264457
2014	14.799770869135031