Year	Percent
1969	30.05
1970	59.39
1973	4.832
1974	13.35
1975	3.027
1976	0.5122
1977	40.26
1978	28.22
1979	9.577
1980	19.39
1981	49.01
1982	79.84
1983	52.11
1984	61.55
1985	34.66
1986	53.82
1987	54.76
1988	59
1989	38.28
1990	13.7
1991	43.15
1992	54.17
1993	27.99
1994	43.65
1995	18.69
1996	4.614
1997	5.766
1998	1.617
1999	1.491
2000	3.227
2001	3.447
2002	22.65
2003	4.925
2004	3.035
2005	3.755
2006	5.717
2007	10.75