1978 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 | 5.16 7.38 7.39 8.06 7.59 9.10 12.19 14.58 15.22 16.13 15.56 18.10 20.01 20.34 | 1.08 1.29 1.29 1.36 1.49 1.71 2.10 2.79 3.16 3.24 3.42 3.65 3.73 3.67 | 1.01 1.04 1.06 1.06 1.16 1.79 2.46 2.92 3.24 3.49 3.58 3.95 4.37 4.26 | 0.39 0.42 0.42 0.44 0.43 0.45 0.48 0.59 0.64 0.71 0.72 0.72 0.70 0.65 |