Year	Percent
1987	44.40639
1988	46.62087
1989	46.07475
1990	44.48899
1991	42.36585
1992	42.93888
1994	48.3494
1995	48.1405
1996	49.33853
1997	47.70535
1998	48.89267
2000	52.5302
2001	53.28902
2002	54.56259
2003	56.32761
2012	77.43312