Year	Ratio
1971-01-01	1.012099981307980
1972-01-01	1.012500047683720
1973-01-01	1.001009941101070
1974-01-01	0.998920023441315
1975-01-01	1.014870047569270
1976-01-01	1.018159985542300
1977-01-01	1.018599987030030
1978-01-01	1.022259950637820
1979-01-01	1.022609949111940
1980-01-01	1.032520055770870
1981-01-01	1.018970012664790
1983-01-01	1.021620035171510
1984-01-01	1.023180007934570
1985-01-01	1.018339991569520
1986-01-01	1.017770051956180
1987-01-01	0.988129973411560
1988-01-01	1.002679944038390
1989-01-01	1.007580041885380
1990-01-01	0.999970018863678
1991-01-01	1.006899952888490
1993-01-01	0.975179970264435
1999-01-01	1.002589941024780
2000-01-01	0.997520029544830
2001-01-01	0.992120027542114
2002-01-01	0.998059988021851
2003-01-01	1.001520037651060
2004-01-01	1.003340005874630