| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 8.29 | 8.77 | 7.55 |
| 2025 | 7.6 | 9.32 | 6.06 |
| 2024 | 5.62 | 6.63 | 5.18 |
| 2023 | 5.73 | 6.43 | 4.11 |
| 2022 | 5.06 | 5.83 | 4.33 |
| 2021 | 4.47 | 5.33 | 3.9 |
| 2020 | 5.36 | 6.17 | 4.37 |
| 2019 | 5.3 | 6.03 | 4.35 |
| 2018 | 5.28 | 6.69 | 4.14 |
| 2017 | 8.55 | 11.24 | 6.34 |
| 2016 | 9.67 | 12.22 | 7.42 |
| 2015 | 14.18 | 20.08 | 9.25 |
| 2014 | 16.58 | 20.31 | 13.6 |
| 2013 | 18.07 | 21.39 | 14.73 |
| 2012 | 9.06 | 14.44 | 5.53 |
| 2011 | 8.98 | 19.99 | 4.06 |
| 2010 | 13.33 | 22.33 | 6.55 |
| 2009 | 15.78 | 22.53 | 5.81 |
| 2008 | 18.45 | 57.3 | 4.54 |
| 2007 | 66.56 | 89.89 | 33.35 |
| 2006 | 26.55 | 56.15 | 11.95 |
| 2005 | 4.22 | 11.93 | 1.75 |
| 2004 | 2.61 | 3.74 | 1.99 |
| 2003 | 2.87 | 3.49 | 2.36 |
| 2002 | 3.43 | 3.93 | 3.19 |
| 2001 | 4.14 | 6.38 | 2.14 |
| 2000 | 2.22 | 2.92 | 1.63 |
| 1999 | 1.87 | 3.54 | 1.17 |
| 1998 | 2.01 | 3.1 | 1.26 |
| 1997 | 4.99 | 5.99 | 4.12 |