| Year | Mean | Min | Max | Cv | Opata | W7984 |
| 2010 | 48.71 | 37.84 | 60.11 | 3.67 | ||
| 2011 | 49.66 | 39.71 | 60.31 | 4.23 | 45.03 | 39.74 |
| 2012 | 45.65 | 35.98 | 57.83 | 4.30 | 41.50 | 36.81 |
| 2013 | 47.94 | 39.80 | 56.53 | 3.53 | ||
| 2010-2013 | 47.99 | 35.98 | 60.31 | 4.21 | 43.27 | 38.27 |