Year	Percent
1969	10.73
1972	1.94
1973	11.5
1975	10.45
1976	10.66
1978	5.859
1979	1.216
1980	1.342
1981	0.04507
1982	0.241
1983	0.3671
1984	42.85
1985	0.6763
1986	0.8182
1987	0.3595
1988	0.3211
1989	0.3185
1990	1.91
1991	1.995
1992	1.995
1993	1.995
1994	1.387
1995	1.587
1996	1.518
1997	21.72
1998	15.23
1999	17.28
2000	15
2001	6.38
2002	13.47
2003	26.01
2004	7.666
2005	6.432
2006	9.69
2007	6.227