Year	% of output
1960	9.403301451755805
1961	9.171128657940827
1962	8.899931492562125
1963	8.742719395912543
1964	8.621861352100034
1965	8.676181430029489
1966	8.72345618363557
1967	8.427768941518263
1968	8.328506450593244
1969	7.965148624220177
1970	8.033758468730547
1971	7.849557826142773
1972	7.968387332827703
1973	7.80430516067394
1974	7.51916904773796
1975	7.97144713844717
1976	7.984911143736509
1977	7.694121773669256
1978	7.773174109807774
1979	7.572104561984151
1980	7.6711258018517485
1981	7.00591530052536
1982	7.3046954157445025
1983	7.47190065042951
1984	6.711042588690475
1985	6.925207206161347
1986	6.480177898717783
1987	5.9670397888772895
1988	5.847488059008256
1989	7.846641613067935
1990	7.509441107516172
1991	6.552117046484487
1992	6.575908628080237
1993	6.8466013300337005
1994	6.6657730409108895
1995	6.7609925540385145
1996	6.741842303004654
1997	6.148369743431639
1998	6.268917691596004
1999	6.0401750895244986
2000	6.1804120088305865
2001	5.636616875158761
2002	6.28548258664439
2003	5.900641231988248
2004	6.278513924546268
2005	6.317202892836563
2006	6.165150168935835
2007	6.080713858117333
2008	5.985054435756524
2009	6.256955765396536
2010	6.058894349668401
2011	6.06899707458801
2012	6.152668508706769
2013	6.009959777040731
2014	5.943498722109275