The Valentine Ski Company makes top-of-the-line custom snow skis for high-end ski shops and employs seventeen people at $21 per hour. Chris, the owner, wants to track several productivity performance measures using the data shown below.

Financial Information	2021 Results
Net sales		$210,000
Cost of goods sold (purchased items)		$30,000
Net income after taxes		$28,800
Current assets		$76,000
Current liabilities		$24,000
Avg. inventory value		$3,800
Inputs and Outputs
Skis produced		600
Labor hours		12,920
Lease payments		$22,000

If the multiple factor productivity for 2020 was 0.002 skis/dollar, then what was the productivity growth from 2020 to 2021? Do not round intermediate calculations. Round your answer to two decimal places. Use a minus sign to enter a negative value, if any.