| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.12 | 9.14 | 2.83 |
| 2024 | 2.47 | 3.69 | 1.45 |
| 2023 | 1.62 | 2.42 | 1.17 |
| 2022 | 1.52 | 2.24 | 1.11 |
| 2021 | 1.85 | 2.58 | 1.43 |
| 2020 | 1.84 | 2.7 | 1.44 |
| 2019 | 1.35 | 1.75 | 0.96 |
| 2018 | 2.15 | 4.04 | 1.01 |
| 2017 | 6.8 | 8.08 | 3.29 |
| 2016 | 6.34 | 9.18 | 4.92 |
| 2015 | 6.06 | 10.81 | 3.95 |
| 2014 | 3.45 | 4.81 | 2.63 |
| 2013 | 3.03 | 3.43 | 2.46 |
| 2012 | 3.49 | 4.46 | 2.86 |
| 2011 | 5.7 | 7.07 | 3.78 |
| 2010 | 6.85 | 9.4 | 5.15 |
| 2009 | 7.57 | 10.16 | 4.19 |
| 2008 | 6.41 | 10.21 | 3.47 |
| 2007 | 3.84 | 7.89 | 1.09 |
| 2006 | 1 | 1.32 | 0.7 |
| 2005 | 1.33 | 2.99 | 0.64 |
| 2004 | 12.12 | 32.25 | 2.69 |