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	17.32	10.47
1996	-8.68	4.38
1997	11.06	6.56
1998	2.93	1.77
1999	19.22	11.07
2000	-4	6.04
2001	13.79	9.67
2002	-0.41	3.12
2003	12.56	8.64
2004	-9.78	0.78
2005	4.81	2.53
2006	6.73	0.58
2007	10.37	7.3
2008	13.9	10.33
2009	-5.22	6.35
2010	-2.01	2.22
2011	2.17	-1.68
2012	-4.89	-1.57