| intensity,year | |
| 0.5172029645833334,2011 | |
| 0.5160452145833334,2012 | |
| 0.51637850625,2013 | |
| 0.5144910229166667,2014 | |
| 0.5101126229166667,2015 | |
| 0.5071936895833333,2016 | |
| 0.50584298125,2017 | |
| 0.5046361145833334,2018 | |
| 0.5151935049999999,2019 | |
| 0.5151935049999999,2020 | |
| 0.5151935049999999,2021 | |
| 0.5151935049999999,2022 | |
| 0.5151935049999999,2023 | |