Year	% of output
1960	9.462629742709774
1961	9.227015913919454
1962	8.947057614913009
1963	8.658531684905634
1964	8.450552351631027
1965	8.28587855226414
1966	7.96859316820463
1967	7.98437319240814
1968	7.792384714937675
1969	7.637738651960762
1970	7.505113253412917
1971	7.319161020177184
1972	7.277337713135706
1973	7.192795544270232
1974	7.0293678108213955
1975	7.292256671206259
1976	7.182957734067863
1977	7.134613193838401
1978	6.998320870944972
1979	6.945669683500745
1980	7.088614053111383
1981	7.0363684707835015
1982	6.985620934170332
1983	7.2587650101574495
1984	7.226786552610475
1985	7.314292776611436
1986	7.028410967955071
1987	7.064857760930277
1988	6.889698848830689
1989	6.760849256526566
1990	7.39940631398969
1991	7.412950089479262
1992	7.52203429088989
1993	8.17228118170237
1994	8.51121433933934
1995	8.624069673834912
1996	8.889864091826002
1997	8.661412472072545
1998	9.100662108575003
1999	8.968973852875296
2000	9.214641885278985
2001	9.21131288048922
2002	9.023785970262194
2003	8.975061890080605
2004	8.805303544762976
2005	8.636182635708876
2006	8.26906658216693
2007	8.166033738517298
2008	8.175973936128571
2009	8.235807395793529
2010	7.9915131840004765
2011	7.898796317506749
2012	8.044326698921955
2013	8.152010833982471
2014	8.02175223729755