Year	%
1975	26.027348603990603
1976	29.0693213214462
1977	34.9316665371421
1978	37.4885141333542
1979	16.0230690272725
1980	16.171685058315298
1981	18.4027777777778
1982	19.1400673052354
1983	28.1037984017336
1984	31.320078305065103
1985	34.0393733085927
1986	40.145892540609005
1987	51.138016673805495
1988	27.905470373366896
1989	31.6454394041084
1990	36.4681406552732
1991	25.1603786472474
1992	26.081574707413
1993	28.1216020384454
1994	33.9017815545258
1995	40.396022361509395
1996	45.642048965437795
1997	52.9904048751054
1998	67.1216740149162
1999	60.5007658395189
2000	101.549804412885
2001	90.633716303322
2002	131.606936426557
2003	110.287277516449
2004	116.67786258249599
2005	100.31488493074801
2006	115.55287597866399
2007	161.214471509264
2008	249.73284426942502
2009	96.9386885594588
2010	84.3129790506478
2011	87.01969566215
2012	64.144912751116
2013	58.274517855735795
2014	60.5381465168062