Year	Rate
1983	4.31
1984	4.42
1985	4.52
1986	4.35
1987	4.39
1988	4.21
1989	3.4
1990	3.61
1991	3.67
1992	3.61
1993	2.98
1994	2.95
1995	2.72
1996	2.96
1997	2.3