considering the years 2005-2007 , what is the average fair value of shares vested , in millions?
Important information:
table_3: the vested of shares is -51206 ( 51206 ) ; the vested of weighted average grant-date fair value is 56.93 ;
table_5: the nonvested restricted stock at december 31 2007 of shares is 1844978 ; the nonvested restricted stock at december 31 2007 of weighted average grant-date fair value is $ 53.61 ;
text_9: 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 .
Reasoning Steps:
Step: add2-1(3.4, 0.6) = 4
Step: add2-2(#0, 2.3) = 6.3
Step: divide2-3(#1, const_3) = 2.1
Program:
add(3.4, 0.6), add(#0, 2.3), divide(#1, const_3)
Program (Nested):
divide(add(add(3.4, 0.6), 2.3), const_3)

Please answer the following financial question based on the context provided. Make sure to give the answer in raw number, not in percentage and without any units. If the question asks for percentage the value should be less than 1
Context:
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
                                               | shares           | weighted average grant-date fair value
nonvested restricted stock at december 31 2006 | 1107455          | $ 45.86                               
granted                                        | 852353           | 63.59                                 
vested                                         | -51206 ( 51206 ) | 56.93                                 
forfeited                                      | -63624 ( 63624 ) | 49.65                                 
nonvested restricted stock at december 31 2007 | 1844978          | $ 53.61                               
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: 
considering the years 2005-2007 , what is the average fair value of shares vested , in millions?
Important information:
table_3: the vested of shares is -51206 ( 51206 ) ; the vested of weighted average grant-date fair value is 56.93 ;
table_5: the nonvested restricted stock at december 31 2007 of shares is 1844978 ; the nonvested restricted stock at december 31 2007 of weighted average grant-date fair value is $ 53.61 ;
text_9: 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 .
Reasoning Steps:
Step: add2-1(3.4, 0.6) = 4
Step: add2-2(#0, 2.3) = 6.3
Step: divide2-3(#1, const_3) = 2.1
Program:
add(3.4, 0.6), add(#0, 2.3), divide(#1, const_3)
Program (Nested):
divide(add(add(3.4, 0.6), 2.3), const_3)
