| Year | Stage of development | |||
| Diameter 1 | Diameter 2 | Length | Height | |
| 2002 | 79 ± 1.9 (12.2) | 84 ± 1.8 (10.7) | 46 ± 1.2 (13.1) | 67 ± 1.9 (13.9) |
| 2003 | 76 ± 2.0 (5.2) | 74 ± 3.7 (10.0) | 44 ± 1.1(4.8) | 61 ± 2.0 (6.5) |
| 2004 | 80 ± 2.0 (8.7) | 85 ± 1.8 (7.5) | 46 ± 1.2 (7.6) | 67 ± 1.8 (7.9) |
| 2011 | 80 ± 1.8 (7.9) | 83 ± 1.6 (7.2) | 46 ± 1.1 (9.7) | 67 ± 1.8 (8.9) |