| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 15.21 | 24.01 | 8.23 |
| 2025 | 7.78 | 9.02 | 5.89 |
| 2024 | 7.23 | 8.64 | 6.44 |
| 2023 | 5.77 | 6.44 | 3.34 |
| 2022 | 3.41 | 6.54 | 1.29 |
| 2021 | 1.1 | 1.74 | 0.41 |
| 2020 | 0.8 | 1.11 | 0.64 |
| 2019 | 1.17 | 2.08 | 0.87 |
| 2018 | 1.95 | 2.51 | 1.1 |
| 2017 | 3.99 | 7.78 | 2.09 |
| 2016 | 11.46 | 19.24 | 3.85 |
| 2015 | 12.21 | 17.97 | 7.37 |
| 2014 | 4.37 | 9.14 | 2.37 |
| 2013 | 2.95 | 3.63 | 2.2 |
| 2012 | 3.57 | 4.77 | 2.69 |
| 2011 | 4.42 | 5.91 | 3.13 |
| 2010 | 3.28 | 4.5 | 2.29 |
| 2009 | 2.63 | 3.85 | 1.23 |
| 2008 | 2.24 | 4.85 | 0.92 |
| 2007 | 3.53 | 5.73 | 1.2 |
| 2006 | 1.15 | 1.46 | 0.89 |
| 2005 | 1.16 | 1.69 | 0.79 |
| 2004 | 2.33 | 3.52 | 1.49 |
| 2003 | 2.69 | 3.68 | 2.36 |
| 2002 | 5.53 | 7.81 | 4 |
| 2001 | 9.59 | 12.63 | 6.69 |
| 2000 | 6.51 | 7.63 | 3.85 |
| 1999 | 5.43 | 9.11 | 3.78 |
| 1998 | 4.69 | 5.76 | 3.36 |