Year	Percent
1980-01-01	2.3995800000000000
1981-01-01	2.3441500000000000
1982-01-01	2.3022600000000000
1983-01-01	1.5579000000000000
1984-01-01	2.0702100000000000
1985-01-01	2.0368900000000000
1986-01-01	2.3908900000000000
1987-01-01	2.5400600000000000
1988-01-01	1.3938900000000000
1989-01-01	1.2761300000000000
1990-01-01	1.4822500000000000
1991-01-01	0.6914650000000000
1992-01-01	0.5954050000000001
1993-01-01	0.5991520000000000
1994-01-01	0.5680470000000001