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In the following chart, the price of logs shown is per cubic meter and that of plywood and saw timber is per ton. Given that $1$ cubic meter of Plywood and Saw Timber = $800$ kg ($1$ ton = 1000 kg)

If $1$ cubic meter = $750$ kg for Saw Timber, in which year was the difference in prices of saw timber and logs the last?

1. $1989$
2. $1990$
3. $1991$
4. $1992$

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