Year	Percent
1981	2.82094
1982	1.91647
1983	-0.64527
1984	2.73675
1985	0.22918
1986	1.34549
1987	0.06384
1988	-5.38974
1989	6.72968
1990	26.188
1991	226.53786
1992	59.57865
1993	51.09105
1994	72.70497
1995	62.37665
1996	103.43915
1997	958.50323
1998	32.20662
1999	2.44303
2000	7.3108
2001	6.10841
2002	3.77371
2003	2.27115
2004	5.65949
2005	6.51169
2006	6.74144
2007	11.0914
2008	8.12977
2009	4.04742
2010	1.10747
2011	5.97863
2012	1.55524
2013	-0.70289
2014	0.4521
2015	2.20583
2016	2.24622
2017	1.17829