| Test of sig | Unbooked N % | Booked N % |
|
| Chi-square test P = 0.005** | 28 (21.4) | 36 (31) | 2011 |
| 30 (22.9) | 28 (24.1) | 2012 | |
| 30 (22.9) | 36 (31) | 2013 | |
| 17 (13) | 10 (8.6) | 2014 | |
| 26 (19.8) | 6 (5.2) | 2015 |