human
schlumberger limited and subsidiaries shares of common stock issued in treasury shares outstanding (stated in millions).
|  | Issued | In Treasury | Shares Outstanding |
| --------- | --------- | --------- | --------- |
| Balance, January 1, 2008 | 1,334 | (138) | 1,196 |
| Shares sold to optionees less shares exchanged | – | 5 | 5 |
| Shares issued under employee stock purchase plan | – | 2 | 2 |
| Stock repurchase program | – | (21) | (21) |
| Issued on conversions of debentures | – | 12 | 12 |
| Balance, December 31, 2008 | 1,334 | (140) | 1,194 |
| Shares sold to optionees less shares exchanged | – | 4 | 4 |
| Vesting of restricted stock | – | 1 | 1 |
| Shares issued under employee stock purchase plan | – | 4 | 4 |
| Stock repurchase program | – | (8) | (8) |
| Balance, December 31, 2009 | 1,334 | (139) | 1,195 |
| Acquisition of Smith International, Inc. | 100 | 76 | 176 |
| Shares sold to optionees less shares exchanged | – | 6 | 6 |
| Shares issued under employee stock purchase plan | – | 3 | 3 |
| Stock repurchase program | – | (27) | (27) |
| Issued on conversions of debentures | – | 8 | 8 |
| Balance, December 31, 2010 | 1,434 | (73) | 1,361 |
see the notes to consolidated financial statements part ii, item 8.
Please answer the following question with expressions if necessary.
what about the average for these years?
assistant
add(1194, 1195), divide(#0, const_2)