| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 9.8 | 11.87 | 8.56 |
| 2024 | 7.25 | 13.97 | 4.76 |
| 2023 | 7.47 | 10.85 | 4.8 |
| 2022 | 7.29 | 13.02 | 4.73 |
| 2021 | 1.17 | 1.82 | 0.48 |
| 2020 | 0.42 | 0.67 | 0.24 |
| 2019 | 0.49 | 0.78 | 0.31 |
| 2018 | 0.91 | 1.55 | 0.48 |
| 2017 | 4.42 | 11.3 | 1.43 |
| 2016 | 2.51 | 4.45 | 1.58 |
| 2015 | 1.98 | 4.54 | 1.34 |
| 2014 | 1.62 | 2.04 | 1.11 |
| 2013 | 1.3 | 1.6 | 1.12 |
| 2012 | 1.19 | 1.45 | 0.98 |
| 2011 | 1.8 | 2.18 | 1.23 |
| 2010 | 2.12 | 2.87 | 1.56 |
| 2009 | 1.75 | 2.13 | 1.29 |
| 2008 | 1.71 | 3.03 | 0.85 |
| 2007 | 3.7 | 6.4 | 1.17 |
| 2006 | 1.17 | 1.4 | 0.89 |
| 2005 | 1.14 | 1.43 | 0.91 |
| 2004 | 1.78 | 2.52 | 1.27 |
| 2003 | 2.51 | 3.27 | 1.93 |
| 2002 | 3.1 | 3.58 | 2.36 |
| 2001 | 4.17 | 5.1 | 3.35 |