| Symbol | Relationship | Date | Transaction | Cost | # Shares | Value($) | Total Shares | Form 4 |
| WM | Director | Jan 15, 2012 | Option Exercise | $33.51 | 1,940 | 65,009 | 20,549 | Jan 18, 2012, 06:00 PM |
| WM | Director | Jan 17, 2012 | Sale | $33.89 | 800 | 27,111 | 20,388 | Jan 18, 2012, 06:00 PM |
| WM | Director | Dec 20, 2011 | Option Exercise | $31.68 | 9,545 | 302,386 | 18,976 | Dec 21, 2011, 11:00 AM |
| WM | Director | Dec 20, 2011 | Option Exercise | $30.24 | 10,000 | 302,400 | 28,521 | Dec 21, 2011, 11:00 AM |
| WM | Director | Jul 15, 2011 | Option Exercise | $36.06 | 1,803 | 65,007 | 19,265 | Jul 18, 2011, 05:45 PM |
| WM | Director | Jul 18, 2011 | Sale | $35.99 | 744 | 26,777 | 18,521 | Jul 18, 2011, 05:45 PM |
| WM | Director | Jan 15, 2011 | Option Exercise | $36.79 | 1,767 | 65,017 | 18,191 | Jan 19, 2011, 03:19 PM |
| WM | Director | Jan 18, 2011 | Sale | $37.18 | 729 | 27,104 | 18,162 | Jan 19, 2011, 03:19 PM |
| PCP | Director | Aug 17, 2010 | Option Exercise | $15.77 | 4,000 | 63,100 | 32,186 | Aug 19, 2010, 12:03 PM |
| PCP | Director | Aug 17, 2010 | Option Exercise | $15.77 | 4,000 | 63,100 | 32,186 | Aug 19, 2010, 12:03 PM |
| PCP | Director | Aug 17, 2010 | Sale | $119.53 | 4,000 | 478,120 | 28,186 | Aug 19, 2010, 12:03 PM |
| PCP | Director | Aug 17, 2010 | Sale | $119.53 | 4,000 | 478,120 | 28,186 | Aug 19, 2010, 12:03 PM |
| WM | Director | Aug 17, 2010 | Option Exercise | $26.38 | 10,000 | 263,750 | 26,424 | Aug 19, 2010, 11:01 AM |
| WM | Director | Aug 17, 2010 | Sale | $34.00 | 10,000 | 340,019 | 16,424 | Aug 19, 2010, 11:01 AM |
| PCP | Director | Jul 24, 2009 | Option Exercise | $9.63 | 4,000 | 38,500 | 29,642 | Aug 11, 2010, 12:25 PM |
| PCP | Director | Jul 24, 2009 | Option Exercise | $9.63 | 4,000 | 38,500 | 29,642 | Aug 11, 2010, 12:25 PM |
| PCP | Director | Jul 24, 2009 | Sale | $79.58 | 4,000 | 318,320 | 25,642 | Aug 11, 2010, 12:25 PM |
| PCP | Director | Jul 24, 2009 | Sale | $79.58 | 4,000 | 318,320 | 25,642 | Aug 11, 2010, 12:25 PM |
| Symbol | Relationship | Date | Transaction | Value($) |
| WM | Director | Jan 15, 2012 | Option Exercise | 65,009 |
| WM | Director | Jan 17, 2012 | Sale | 27,111 |
| WM | Director | Dec 20, 2011 | Option Exercise | 302,386 |
| WM | Director | Dec 20, 2011 | Option Exercise | 302,400 |
| WM | Director | Jul 15, 2011 | Option Exercise | 65,007 |
| WM | Director | Jul 18, 2011 | Sale | 26,777 |
| WM | Director | Jan 15, 2011 | Option Exercise | 65,017 |
| WM | Director | Jan 18, 2011 | Sale | 27,104 |
| PCP | Director | Aug 17, 2010 | Option Exercise | 63,100 |
| PCP | Director | Aug 17, 2010 | Option Exercise | 63,100 |
| PCP | Director | Aug 17, 2010 | Sale | 478,120 |
| PCP | Director | Aug 17, 2010 | Sale | 478,120 |
| WM | Director | Aug 17, 2010 | Option Exercise | 263,750 |
| WM | Director | Aug 17, 2010 | Sale | 340,019 |
| PCP | Director | Jul 24, 2009 | Option Exercise | 38,500 |
| PCP | Director | Jul 24, 2009 | Option Exercise | 38,500 |
| PCP | Director | Jul 24, 2009 | Sale | 318,320 |
| PCP | Director | Jul 24, 2009 | Sale | 318,320 |