Year	% of output
1971	14.754905177505085
1972	13.893339436942092
1973	13.210689287294112
1974	12.103012315673856
1975	13.057209312250603
1976	14.005784099628166
1977	13.69215897276889
1978	14.088981170916965
1979	16.315598758527248
1980	17.92965442930809
1981	19.58021726866384
1982	16.585174779836837
1983	17.709349861532374
1984	19.842369541727578
1985	17.722456156586922
1986	16.589289570287196
1987	17.697126238076837
1988	19.103513035793195
1989	18.03197195259151
1990	15.325857457889551
1991	15.878202679504232
1992	17.00915842711988
1993	16.486772679140326
1994	17.783180461929494
1995	18.32778705698852
1996	19.206963972154075
1997	19.911543959971407
1998	21.431988266409434
1999	20.316055149551723
2000	20.242527961963138
2001	20.990304850292485
2002	20.921563501515283
2003	19.81450437888734
2004	19.42699769334906
2005	18.87981059759439
2006	18.48322549787395
2007	16.701349633022012
2008	17.832455089193672
2009	17.368572816123354
2010	15.574085340395328
2011	15.729614577719387
2012	15.663742955826214
2013	15.922078950494265
2014	16.36527625032174