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: humana inc . notes to consolidated financial statements 2014 ( continued ) the total intrinsic value of stock options exercised during 2007 was $ 133.9 million , compared with $ 133.7 million during 2006 and $ 57.8 million during 2005 . cash received from stock option exercises for the years ended december 31 , 2007 , 2006 , and 2005 totaled $ 62.7 million , $ 49.2 million , and $ 36.4 million , respectively . total compensation expense related to nonvested options not yet recognized was $ 23.6 million at december 31 , 2007 . we expect to recognize this compensation expense over a weighted average period of approximately 1.6 years . restricted stock awards restricted stock awards are granted with a fair value equal to the market price of our common stock on the date of grant . compensation expense is recorded straight-line over the vesting period , generally three years from the date of grant . the weighted average grant date fair value of our restricted stock awards was $ 63.59 , $ 54.36 , and $ 32.81 for the years ended december 31 , 2007 , 2006 , and 2005 , respectively . activity for our restricted stock awards was as follows for the year ended december 31 , 2007 : shares weighted average grant-date fair value . <table class='wikitable'><tr><td>1</td><td>-</td><td>shares</td><td>weighted average grant-date fair value</td></tr><tr><td>2</td><td>nonvested restricted stock at december 31 2006</td><td>1107455</td><td>$ 45.86</td></tr><tr><td>3</td><td>granted</td><td>852353</td><td>63.59</td></tr><tr><td>4</td><td>vested</td><td>-51206 ( 51206 )</td><td>56.93</td></tr><tr><td>5</td><td>forfeited</td><td>-63624 ( 63624 )</td><td>49.65</td></tr><tr><td>6</td><td>nonvested restricted stock at december 31 2007</td><td>1844978</td><td>$ 53.61</td></tr></table> the fair value of shares vested during the years ended december 31 , 2007 , 2006 , and 2005 was $ 3.4 million , $ 2.3 million , and $ 0.6 million , respectively . total compensation expense related to nonvested restricted stock awards not yet recognized was $ 44.7 million at december 31 , 2007 . we expect to recognize this compensation expense over a weighted average period of approximately 1.4 years . there are no other contractual terms covering restricted stock awards once vested. .
Question: what was the fair value of shares vested during 2007?
Answer: 3.4
Question: what was the value of shares vested in 2005?
Answer: 0.6
Question: what is the sum?
Answer: 4.0
Question: what is the total sum including shares vested in 2004?
Answer: 6.3
Question: what is the total sum divided by 3?

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