| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Cascade Investment, L.L.C. | 20% | 7,062,629 | 7,062,629 | 0 | /s/ Alan Heuberger | Alan Heuberger, Attorney-in-fact for, Michael Larson, Business Manager | 0001052192 |
| William H. Gates III | 20% | 7,062,629 | 7,062,629 | 0 | /s/ Alan Heuberger | Alan Heuberger, Attorney-in-fact | 0000902012 |