1989   5.0   5.0   5.0   5.0
 1990  -1.0  -1.0  -1.0  -1.0
 1991   3.0   3.0   3.0   3.1
 1992   5.0   5.0   5.0   5.2
 1993   9.7  13.6   8.5   9.5
 1994  17.8   5.0  11.6  44.2
 1995   5.0   4.5   4.5   6.8