Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.

Text: republic services , inc . notes to consolidated financial statements 2014 ( continued ) 12 . share repurchases and dividends share repurchases share repurchase activity during the years ended december 31 , 2018 and 2017 follows ( in millions except per share amounts ) : . <table class='wikitable'><tr><td>1</td><td>-</td><td>2018</td><td>2017</td></tr><tr><td>2</td><td>number of shares repurchased</td><td>10.7</td><td>9.6</td></tr><tr><td>3</td><td>amount paid</td><td>$ 736.9</td><td>$ 610.7</td></tr><tr><td>4</td><td>weighted average cost per share</td><td>$ 69.06</td><td>$ 63.84</td></tr></table> as of december 31 , 2018 , there were no repurchased shares pending settlement . in october 2017 , our board of directors added $ 2.0 billion to the existing share repurchase authorization that now extends through december 31 , 2020 . share repurchases under the program may be made through open market purchases or privately negotiated transactions in accordance with applicable federal securities laws . while the board of directors has approved the program , the timing of any purchases , the prices and the number of shares of common stock to be purchased will be determined by our management , at its discretion , and will depend upon market conditions and other factors . the share repurchase program may be extended , suspended or discontinued at any time . as of december 31 , 2018 , the remaining authorized purchase capacity under our october 2017 repurchase program was $ 1.1 billion . dividends in october 2018 , our board of directors approved a quarterly dividend of $ 0.375 per share . cash dividends declared were $ 468.4 million , $ 446.3 million and $ 423.8 million for the years ended december 31 , 2018 , 2017 and 2016 , respectively . as of december 31 , 2018 , we recorded a quarterly dividend payable of $ 121.0 million to shareholders of record at the close of business on january 2 , 2019 . 13 . earnings per share basic earnings per share is computed by dividing net income attributable to republic services , inc . by the weighted average number of common shares ( including vested but unissued rsus ) outstanding during the period . diluted earnings per share is based on the combined weighted average number of common shares and common share equivalents outstanding , which include , where appropriate , the assumed exercise of employee stock options , unvested rsus and unvested psus at the expected attainment levels . we use the treasury stock method in computing diluted earnings per share. .
Question: what is the amount of cash dividend declared in 2018?
Answer: 468.4
Question: what about in 2017?
Answer: 446.3
Question: what is the sum for these years?
Answer: 914.7
Question: how about the cash dividend declared in 2016?
Answer: 423.8
Question: what is the sum for these three years?
Answer: 1338.5
Question: what is the net change in the weighted average cost per share from 2017 to 2018?

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