| Year | Real | Predictions | Relative error | Level ratio |
| 2008 | 3636 | 3636 | 0.00% | 0.00 |
| 2009 | 3686 | 3713 | −0.73% | −0.125 |
| 2010 | 3854 | 3807 | 1.32% | 0.114 |
| 2011 | 4256 | 4197 | 1.39% | −0.153 |
| 2012 | 4376 | 4318 | 1.33% | 0.144 |
| 2013 | 4538 | 4601 | −1.39% | 0.054 |
| 2014 | 4774 | 4754 | 0.42% | 0.043 |
| 2015 | 5058 | 5123 | −1.29% | −0.174 |
| 2016 | 5268 | 5203 | 1.23% | 0.026 |