| Boxplot statistics |
| Variable | lower whisker | lower hinge | median | upper hinge | upper whisker |
| Januari | 9492 | 9659 | 9799 | 9928 | 10158 |
| Februari | 8641 | 8686 | 9014.5 | 9225 | 9511 |
| Maart | 9402 | 9782 | 9891 | 10313 | 10474 |
| April | 9080 | 9441 | 9607 | 9701 | 9819 |
| Mei | 9162 | 9294 | 9731 | 10195 | 10540 |
| Juni | 8971 | 9464 | 9626.5 | 10048 | 10281 |
| Juli | 10010 | 10082 | 10207 | 10444 | 10915 |
| Augustus | 9548 | 9793 | 10104.5 | 10541 | 11183 |
| September | 9313 | 9563 | 9933.5 | 10208 | 10695 |
| Oktober | 9365 | 9596 | 9854 | 10233 | 10834 |
| November | 8820 | 8919 | 9238.5 | 9439 | 9886 |
| December | 9241 | 9391 | 9597.5 | 9963 | 10216 |
| Boxplot Notches |
| Variable | lower bound | median | upper bound |
| Januari | 9664.59687488752 | 9799 | 9933.40312511248 |
| Februari | 8745.19410990474 | 9014.5 | 9283.80589009526 |
| Maart | 9625.69122886719 | 9891 | 10156.3087711328 |
| April | 9477.09363372028 | 9607 | 9736.90636627972 |
| Mei | 9280.82447685375 | 9731 | 10181.1755231463 |
| Juni | 9334.71031574094 | 9626.5 | 9918.28968425906 |
| Juli | 10026.130366949 | 10207 | 10387.869633051 |
| Augustus | 9730.76937701066 | 10104.5 | 10478.2306229893 |
| September | 9611.23228365224 | 9933.5 | 10255.7677163478 |
| Oktober | 9535.72940261469 | 9854 | 10172.2705973853 |
| November | 8978.68726744057 | 9238.5 | 9498.31273255943 |
| December | 9311.70599418462 | 9597.5 | 9883.29400581538 |
