Year	Percent
1978	5.27105
1979	10.4837
1980	7.27427
1981	15.40281
1982	6.27268
1983	-0.38886
1984	3.74353
1985	1.82191
1986	6.81319
1987	5.61404
1988	7.56747
1989	5.70587
1990	7.51646
1991	2.7539
1992	4.83252
1993	1.69801
1994	5.56229
1995	2.10007
1996	0.44195
1997	4.74163
1998	2.85235
1999	3.35021
2000	-2.58878
2001	3.96557
2002	2.14305
2003	0.04215
2004	4.22918
2005	-0.63585
2006	15.04638
2007	6.12722
2008	3.14426
2009	0.9186
2010	-0.27273
2011	4.33551
2012	-1.90193
2013	1.02781
2014	1.51056
2015	-0.36385
2016	1.3558
2017	2.17564