( 1 ) the average exercise price of options per share was $ 26.79 , $ 33.32 , and $ 26.93 for 2018 , 2017 , and 2016 , respectively . in 2017 , had arconic generated sufficient net income , 30 million , 14 million , 5 million , and 1 million potential shares of common stock related to the mandatory convertible preferred stock , convertible notes , stock awards , and stock options , respectively , would have been included in diluted average shares outstanding