Year	Percent
1980-01-01	8.43955000000000000
1981-01-01	7.38595000000000000
1982-01-01	5.28621000000000000
1983-01-01	3.23619000000000000
1984-01-01	2.23265999999999960
1985-01-01	1.97804000000000020
1986-01-01	3.12544000000000000
1987-01-01	3.65536000000000000
1988-01-01	3.96621000000000000
1989-01-01	4.02316999999999950
1990-01-01	3.47609000000000000
1991-01-01	4.39960000000000000
1992-01-01	6.02584000000000050
1993-01-01	7.92263000000000100
1994-01-01	7.50373000000000000
1995-01-01	6.02361000000000000
1996-01-01	3.90385000000000000
1997-01-01	1.80055000000000000
1998-01-01	0.46957700000000000
1999-01-01	0.43822100000000000
2000-01-01	0.40405300000000000
2001-01-01	0.38471500000000003
2002-01-01	0.23916800000000000