Year	Percent
1987	48.43133
1988	51.08138
1989	49.91593
1990	48.88709
1991	46.12642
1992	47.29711
1994	52.92428
1995	52.0323
1996	53.85764
1997	51.23954
1998	53.2471
2000	56.72277
2001	57.62573
2002	59.58116
2003	60.81437
2012	83.46979