| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 0 | ||
| 2022 | 2.19 | 4.07 | 0.4 |
| 2021 | 2.56 | 5.26 | 1.03 |
| 2020 | 0.89 | 1.65 | 0.67 |
| 2019 | 0.96 | 1.41 | 0.73 |
| 2018 | 1.32 | 2.28 | 0.85 |
| 2017 | 2.06 | 3.38 | 1.35 |
| 2016 | 2.59 | 8.7 | 1.81 |
| 2015 | 3.49 | 4.25 | 2.14 |
| 2014 | 1.81 | 3.12 | 1.3 |
| 2013 | 1.48 | 2.18 | 1.13 |
| 2012 | 1.21 | 1.47 | 1 |
| 2011 | 1.83 | 2.39 | 1.16 |
| 2010 | 1.89 | 2.64 | 1.2 |
| 2009 | 1.76 | 2.67 | 1.21 |
| 2008 | 1.44 | 2.56 | 0.63 |
| 2007 | 3.45 | 9.17 | 0.83 |
| 2006 | 1.21 | 2.05 | 0.72 |
| 2005 | 1.1 | 1.5 | 0.82 |
| 2004 | 1.92 | 2.64 | 1.44 |
| 2003 | 2.25 | 2.87 | 1.85 |
| 2002 | 3.6 | 3.95 | 3.2 |
| 2001 | 4.5 | 5.74 | 3.07 |