1988  -1.0  -1.0  -1.0  -1.0
 1989  -1.0  -1.0  -1.0  -1.0
 1990  -1.0  -1.0  -1.0  -1.0
 1991  -1.0  -1.0  -1.0  -1.0
 1992  -1.0  -1.0  -1.0  -1.0
 1993  -1.0  -1.0  -1.0  -1.0
 1994   0.7   0.7   0.7   0.8