Year	Percent
1961	3.50597
1962	1.96728
1963	6.01161
1964	4.87228
1965	7.6107
1966	3.0619
1967	2.64747
1968	4.40548
1969	2.70884
1970	8.3855
1971	-2.21874
1972	-1.90032
1973	4.14193
1974	0.6491
1975	1.22015
1976	2.06122
1977	0.82249
1978	4.72905
1979	0.50053
1980	6.68558
1981	4.40511
1982	3.02787
1983	3.2498
1984	1.61365
1985	4.10306
1986	2.12947
1987	3.10477
1988	4.31897
1989	1.83506
1990	1.46087
1991	2.166
1992	4.8494
1993	-0.85914
1994	1.12167
1995	2.34806
1996	2.25811
1997	-1.44951
1998	0.09508
1999	1.24687
2000	1.91354
2001	-0.23443
2002	1.04604
2003	2.68182
2004	5.17755
2005	5.47816
2006	4.0253
2007	2.71503
2008	-0.3567
2009	0.73564
2010	-0.48466
2011	0.61062
2012	1.33855
2013	2.21269
2014	2.51197
2015	2.61073
2016	3.43865
2017	3.6552