Year	Percent
1991	-2.22958
1992	-23.76383
1993	-24.2594
1994	-20.77814
1995	-12.80997
1996	0.28217
1997	4.78428
1998	8.96089
1999	6.46158
2000	10.19103
2001	9.05182
2002	9.7778
2003	10.36068
2004	9.23949
2005	25.11444
2006	33.03049
2007	23.63913
2008	8.47061
2009	7.16254
2010	3.61419
2011	-1.22948
2012	0.85099
2013	4.43707
2014	0.73474
2015	-0.09717
2016	-4.17717
2017	-0.96182