Year	Percent
1971	-0.1395
1972	0.6987
1973	0.10644
1974	-0.02784
1975	0.31455
1976	0.27403
1977	0.29078
1978	-0.07249
1979	0.1918
1980	0.13449
1981	0.23913
1982	0.11408
1983	0.24265
1984	0.81672
1985	0.20785
1986	-0.45213
1987	-0.28648
1988	0.32505
1989	0.29166
1990	0.21364
1991	0.04424
1992	-0.77277
1993	0.1441
1994	0.83661
1995	4.11723
1996	1.61102
1997	2.33532
1998	0.30368
1999	0.06332
2000	2.03721
2001	6.0259
2002	-0.31655
2003	1.53833
2004	1.55829
2005	2.56553
2006	2.14782
2007	2.52974
2008	2.73241
2009	6.35112
2010	3.47953
2011	4.28527
2012	3.19757
2013	2.32405
2014	1.00097
2015	2.10165
2016	2.53789
2017	1.73731