Year	sprdRate	3yearAverRate
1984	31.95	31.95
1985	-9999	31.95
1986	-9999	31.95
1987	-9999	-9999
1988	21.14	21.14
1989	19.5	20.32
1990	4.83	15.16
1991	4	9.44
1992	12.3	7.04
1993	9.59	8.63
1994	4.52	8.8
1995	15.73	9.95
1996	-11.42	2.94
1997	-7.19	-0.96
1998	4.86	-4.58
1999	13.21	3.63
2000	16.6	11.56
2001	16.1	15.31
2002	-14.55	6.05
2003	7.45	3
2004	-12.67	-6.59
2005	14.27	3.01
2006	8.52	3.37
2007	9.43	10.74
2008	-4.58	4.45
2009	-1.47	1.12
2010	-2.5	-2.85
2011	7.66	1.22
2012	-2.63	0.84