$-1\mathrm{.}6$ George Kyparisis $($using data from Problem $1\mathrm{.}5)$ determines his costs to be as follows:

Labor: $$10$ per hour

Resin: $$5$ per pound

Capital expense: $1\%$ per month of investment

Energy: $$0\mathrm{.}50$ per BTU

Show the percent change in productivity for $1$ month last year versus $1$ month this year, on a multifactor basis with dollars as the common denominator.