Various financial data for SunPath Manufacturing for 2019 and 2020 follow. 2019 2020 Output: Sales $ 300,000 $ 330,000 Inputs: Labor 40,000 43,000 Raw Materials 45,000 51,000 Energy 10,000 9,000 Capital Employed 250,000 262,000 Other 2,000 6,000 What is the percentage change in the energy partial productivity measure for SunPath between 2019 and 2020