Year	%
1975	6.40003999955556
1976	7.03187749001335
1977	6.0244885743630805
1978	5.78068882144308
1979	7.68880721226586
1980	7.69982129134693
1981	7.422710468648059
1982	12.0765845861787
1983	12.2048314270049
1984	11.6887483754712
1985	10.5953956935183
1986	12.8593168887977
1987	19.3274169355666
1988	14.013528719823801
1989	11.342904527829099
1990	11.132148667002099
1991	9.507379741709041
1992	12.1220062740914
1993	13.5380200993309
1994	15.4440471122902
1995	14.983096910945301
1996	18.415014498497
1997	20.7888484899471
1998	24.1605603722046
1999	27.4592825685822
2000	21.144267892266
2001	22.777988820752203
2002	29.922200786851
2003	23.8287903691687
2004	27.4861479021467
2005	36.9253773540627
2006	34.140438879038
2007	60.061718113211604
2008	114.05171227031701
2009	47.4417344853639
2010	39.9730372491653
2011	45.0244362865391
2012	33.6960449074801
2013	30.8038918739165
2014	28.3330126594545