| (n = 252) | n (%) | |
| Year | 2004 | 39 (15.5) |
| 2005 | 38 (15.1) | |
| 2006 | 42 (16.7) | |
| 2007 | 32 (12.7) | |
| 2008 | 44 (17.5) | |
| 2009 | 57 (22.6) | |
| Age group (years) | 0 - 9 years | 8 (3.2) |
| 10 - 19 years | 17 (6.8) | |
| 20 - 29 years | 22 (8.7) | |
| 30 - 39 years | 32 (12.7) | |
| 40 - 49 years | 42 (16.7) | |
| 50 - 59 years | 54 (21.4) | |
| 60 - 69 years | 38 (15.1) | |
| 70 - 79 years | 27 (10.7) | |
| 80 - 95 years | 12 (4.8) | |
| Primary site | Accessory sinuses | 35 (13.9) |
| Hypopharynx | 2 (0.8) | |
| Larynx | 34 (13.5) | |
| Nasal cavity and middle ear | 12 (4.8) | |
| Nasopharynx | 29 (11.5) | |
| Oral cavity | 74 (29.4) | |
| Oropharynx | 14 (5.6) | |
| Salivary gland | 31 (12.3) | |
| Thyroid gland | 21 (8.3) |