Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 1987 18.58 18.86 19.86 18.98 18.31 18.76 17.78 17.05 1988 16.75 15.73 14.73 16.60 16.31 15.54 14.91 14.89 13.18 12.41 13.02 15.31 1989 17.17 16.89 18.70 20.32 18.63 17.67 17.62 16.77 17.77 18.91 18.73 19.84
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