Year	Percent
1984-01-01	93.6930
1985-01-01	94.8097
1986-01-01	97.1938
1987-01-01	98.9543
1988-01-01	99.1317
1989-01-01	99.4065
1990-01-01	99.5968
1991-01-01	99.6902
1992-01-01	99.7620
1993-01-01	99.7111
1994-01-01	99.7347
1995-01-01	99.8331
1996-01-01	99.8213
1997-01-01	99.7860
1998-01-01	99.7176
1999-01-01	99.6071
2000-01-01	99.5350
2001-01-01	99.7547