A local industrial plant produces plastic containers for use in the food packaging industry. Last year, its average monthly production was 20,000 containers produced using one shift five days a week with an eight-hour-a-day operation. Of the items produced, 15% were deemed defective. The 15% defective containers are scrapped due to quality problems that are identified after they have completed the production process. Recently, the plant has implemented new production methods and a new quality improvement program. Its monthly production has increased to 25,000 containers with 10% defective. Calculate the percentage change in productivity (\%). (Please answer to two decimal places)