Year	Percent
1970	14.42516
1971	27.04587
1972	26.0994
1973	25.10463
1974	30.36796
1975	30.76173
1976	40.22186
1977	43.36378
1978	37.56929
1979	38.91318
1980	45.28787
1981	55.54678
1982	50.99454
1983	67.34017
1984	58.65855
1985	85.988
1986	193.67021
1987	154.57132
1988	103.84798
1989	123.22231
1990	206.35931
1991	176.65581
1992	229.65928
1993	214.74
1994	195.11958
1995	152.67374
1996	136.58056
1997	144.07777
1998	206.19806
1999	204.54057
2000	202.62332
2001	119.42745
2002	116.49646
2003	117.20555
2004	120.31595
2005	113.50831
2006	82.72863
2007	24.33528
2008	23.4678
2009	31.72297
2010	35.20266
2011	36.20402
2012	28.72549
2013	28.51752
2014	25.27832
2015	32.8579
2016	44.83686