Year	Percent
1985	1.774
1986	2.111
1987	8.15
1988	8.283
1989	11.49
1990	15.19
1991	9.817
1994	7.503
1995	2.854
1996	2.855
1998	12.66
1999	16.87
2000	22.29
2002	20.58
2003	19.9
2004	22.44
2005	24.23
2006	19.64
2007	24.3