| Year | Spring | Summer | Autumn | Winter | Year |
| 2025 | 89.8 | 89.8 | |||
| 2024 | 377.6 | 502.0 | 241.1 | 147.4 | 1268.1 |
| 2023 | 462.7 | 539.1 | 256.4 | 130.7 | 1388.9 |
| 2022 | 499.2 | 684.3 | 264.5 | 0.0 | 1448.0 |
| 2021 | 546.1 | 508.1 | 255.8 | 130.4 | 1440.4 |
| 2020 | 637.6 | 415.9 | 288.9 | 164.4 | 1506.8 |
| 2019 | 528.7 | 536.0 | 261.0 | 160.3 | 1486.0 |
| 2018 | 443.4 | 562.5 | 325.4 | 164.4 | 1495.7 |
| 2017 | 462.5 | 474.4 | 237.0 | 208.5 | 1382.4 |
| 2016 | 526.1 | 455.0 | 284.2 | 159.8 | 1425.1 |
| 2015 | 536.4 | 525.3 | 303.6 | 137.6 | 1502.9 |
| 2014 | 444.5 | 670.8 | 337.4 | 242.8 | 1695.5 |
| 2013 | 463.0 | 636.8 | 251.0 | 172.6 | 1523.4 |
| 2012 | 492.5 | 421.8 | 300.8 | 181.3 | 1396.4 |
| 2011 | 556.2 | 527.9 | 305.9 | 158.6 | 1548.6 |
| 2010 | 580.1 | 558.3 | 376.8 | 232.4 | 1747.6 |
| 2009 | 274.3 | 274.3 |
| Year | Spring | Summer | Autumn | Winter | Year |
| Average | 477.9 | 534.5 | 286.0 | 156.8 | 1330.6 |
| Max | 637.6 | 684.3 | 376.8 | 274.3 | 1747.6 |
| Min | 89.8 | 415.9 | 237.0 | 0.0 | 89.8 |
