Year	Percent
1969-01-01	0.1591176
1970-01-01	0.3217641
1971-01-01	0.5085180
1972-01-01	0.6739795
1973-01-01	0.7631886
1974-01-01	0.8137840
1975-01-01	0.6537458
1976-01-01	0.7918305
1977-01-01	0.7875305
1978-01-01	0.7866780
1979-01-01	0.9473372
1980-01-01	1.0496120
1981-01-01	1.0482590
1982-01-01	1.1666770
1983-01-01	1.2929890
1984-01-01	1.3598610
1985-01-01	1.3333430
1986-01-01	1.4315190
1987-01-01	1.6379540
1988-01-01	1.9991320
1989-01-01	2.2460160
1990-01-01	2.0189530
1991-01-01	1.6783440
1992-01-01	1.1808500
1993-01-01	1.0568340
1996-01-01	0.8798108
1997-01-01	0.6868176
1998-01-01	0.7809177
1999-01-01	0.8953087
2000-01-01	0.9093925
2001-01-01	0.8509588
2002-01-01	0.8538731
2003-01-01	0.8441362