Please answer the given financial question based on the context.
Context: schlumberger limited and subsidiaries shares of common stock ( stated in millions ) issued in treasury shares outstanding .
||issued|in treasury|shares outstanding|
|balance january 1 2010|1334|-139 ( 139 )|1195|
|acquisition of smith international inc .|100|76|176|
|shares sold to optionees less shares exchanged|2013|6|6|
|shares issued under employee stock purchase plan|2013|3|3|
|stock repurchase program|2013|-27 ( 27 )|-27 ( 27 )|
|issued on conversions of debentures|2013|8|8|
|balance december 31 2010|1434|-73 ( 73 )|1361|
|shares sold to optionees less shares exchanged|2013|6|6|
|vesting of restricted stock|2013|1|1|
|shares issued under employee stock purchase plan|2013|3|3|
|stock repurchase program|2013|-37 ( 37 )|-37 ( 37 )|
|balance december 31 2011|1434|-100 ( 100 )|1334|
|shares sold to optionees less shares exchanged|2013|4|4|
|shares issued under employee stock purchase plan|2013|4|4|
|stock repurchase program|2013|-14 ( 14 )|-14 ( 14 )|
|balance december 31 2012|1434|-106 ( 106 )|1328|
see the notes to consolidated financial statements .
Question: the stock repurchase program reduced shares outstanding by how many million shares in the period?


Answer: The answer is:64.0