On January 1, 2020, Coronado Corporation purchased 1,800 shares of treasury stock. Other information regarding Coronado Corporation is provided as follows. 2020 Net income Dividends on preferred stock Dividends on common stock Common stockholders' equity beginning of year Common stockholders' equity end of year 2019 $205,000 $34,000 $18,000 $595,000 $667,000 $220,000 $34,000 $25,000 $667,000 $746,000 Compute return on common stockholders' equity for each year. (Round answer to 1 decimal place, e.g. 10.5.) 2019 2020 Return on common stockholders' equity 17.1 % 22.7 %