| year | type | obsValue |
|---|---|---|
| 2018 | total | 636493 |
| 2017 | total | 657734 |
| 2016 | total | 757839 |
| 2015 | total | 768361 |
| 2014 | total | 779251 |
| 2013 | total | 754106 |
| 2012 | total | 779851 |
| 2018 | server cooling | 48146 |
| 2017 | server cooling | 65304 |
| 2016 | server cooling | 59478 |
| 2015 | server cooling | 96259 |
| 2014 | server cooling | 105179 |
| 2013 | server cooling | 93040 |
| 2012 | server cooling | 93427 |
| 2018 | server room | 193333 |
| 2017 | server room | 224283 |
| 2016 | server room | 271749 |
| 2015 | server room | 265330 |
| 2014 | server room | 276216 |
| 2013 | server room | 264860 |
| 2012 | server room | 260231 |
| 2017 | staff | 395014 |
| 2017 | staff | 419702 |
| 2016 | staff | 426612 |
| 2015 | staff | 406772 |
| 2014 | staff | 397856 |
| 2013 | staff | 396206 |
| 2012 | staff | 426193 |