Year | Mean | Standard deviation | Variance | Minimum | Maximum |
2009 | 387.149 | 28.710 | 824.269 | 372.948 | 477.398 |
2010 | 381.162 | 4.386 | 19.239 | 372.887 | 387.056 |
2011 | 382.833 | 4.778 | 22.826 | 372.579 | 388.765 |
2012 | 386.839 | 4.639 | 21.524 | 380.198 | 398.513 |
2013 | 388.241 | 4.004 | 16.035 | 382.363 | 393.243 |