| Year | Spring | Summer | Autumn | Winter | Year |
| 2025 | 7.7 | 7.7 | |||
| 2024 | 308.0 | 190.4 | 300.6 | 195.8 | 994.8 |
| 2023 | 249.4 | 214.5 | 328.5 | 331.5 | 1123.9 |
| 2022 | 125.3 | 108.1 | 335.6 | 232.1 | 801.1 |
| 2021 | 120.7 | 173.2 | 240.0 | 191.8 | 725.7 |
| 2020 | 156.3 | 292.7 | 259.0 | 345.0 | 1053.0 |
| 2019 | 124.7 | 195.6 | 411.5 | 353.7 | 1085.5 |
| 2018 | 235.8 | 99.6 | 299.5 | 221.4 | 856.3 |
| 2017 | 123.3 | 232.3 | 241.1 | 337.1 | 933.8 |
| 2016 | 180.8 | 146.3 | 299.5 | 173.7 | 800.3 |
| 2015 | 153.3 | 205.7 | 255.3 | 442.6 | 1056.9 |
| 2014 | 215.5 | 128.6 | 229.9 | 334.6 | 908.6 |
| 2013 | 213.5 | 187.7 | 261.2 | 418.7 | 1081.1 |
| 2012 | 227.8 | 392.7 | 334.8 | 346.6 | 1301.9 |
| 2011 | 73.7 | 211.5 | 236.2 | 232.7 | 754.1 |
| 2010 | 157.2 | 193.5 | 327.4 | 268.3 | 946.4 |
| 2009 | 269.2 | 269.2 |
| Year | Spring | Summer | Autumn | Winter | Year |
| Average | 167.1 | 198.2 | 290.7 | 276.2 | 864.7 |
| Max | 308.0 | 392.7 | 411.5 | 442.6 | 442.6 |
| Min | 7.7 | 99.6 | 229.9 | 173.7 | 7.7 |
