Year	Percent
1977	2.60471
1978	5.39817
1979	3.9034
1980	8.39009
1981	8.70733
1982	2.79713
1983	1.05488
1984	5.18845
1985	17.51718
1986	5.39021
1987	4.11691
1988	4.24175
1989	5.86896
1990	4.31043
1991	4.30807
1992	4.10665
1993	6.70324
1994	8.03626