Year	Percent
1976	12.73674
1977	15.18185
1978	6.62472
1979	13.28554
1980	7.09064
1981	11.55991
1982	5.0549
1983	-0.41782
1984	1.7723
1985	2.96611
1986	5.78312
1987	28.11784
1988	8.92224
1989	5.23629
1990	43.8497
1991	12.32691
1992	35.65134
1993	159.01107
1994	439.02348
1995	273.95011
1996	11.096
1997	1.89981
1998	0.09019
1999	103.22043
2000	54.75959
2001	35.17311
2002	45.98848
2003	23.07131
2004	12.32105
2005	15.48525
2006	41.61999
2007	6.4252
2008	15.52114
2009	6.48362
2010	7.19655
2011	13.84445
2012	10.7352
2013	0.38377
2014	1.58369
2015	-2.10025
2016	30.53789
2017	21.78382