1989  43.2  38.5  44.0  45.4
 1990  32.7  30.7  27.1  48.3
 1991   9.9   6.7   9.9  12.6
 1992  23.1  30.8  20.5  22.8
 1993  74.3  76.2  75.2  70.2
 1994  67.7  39.2  69.5  87.6
 1995  40.5  31.1  37.5  55.6