| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 17.33 | 18.3 | 16.26 |
| 2025 | 13.75 | 17.75 | 10.33 |
| 2024 | 13.3 | 17.44 | 8.61 |
| 2023 | 10.58 | 23.43 | 0.52 |
| 2022 | 5.98 | 16.26 | 3.47 |
| 2021 | 12.97 | 22.27 | 7.43 |
| 2020 | 14.17 | 21.31 | 9.4 |
| 2019 | 13.92 | 15.51 | 11.85 |
| 2018 | 15.57 | 19.53 | 12.32 |
| 2017 | 20.91 | 23.62 | 18.52 |
| 2016 | 29.29 | 40.44 | 22.3 |
| 2015 | 26.59 | 42.65 | 17.09 |
| 2014 | 13.87 | 20.71 | 12.45 |
| 2013 | 14.64 | 17.15 | 12.16 |
| 2012 | 11.64 | 14.61 | 9.1 |
| 2011 | 11.45 | 13.96 | 9.09 |
| 2010 | 14.25 | 16.95 | 11.48 |
| 2009 | 12.02 | 16.5 | 7.6 |
| 2008 | 12.06 | 24.05 | 6.27 |
| 2007 | 21.61 | 32.01 | 13.84 |
| 2006 | 11.13 | 14.23 | 9.51 |
| 2005 | 2.24 | 10.75 | 0.3 |
| 2004 | 15.83 | 57.21 | 0.58 |
| 2003 | 18.49 | 51.5 | 4.09 |
| 2002 | 7.68 | 13.02 | 3.83 |
| 2001 | 16.37 | 30.69 | 8.87 |
| 2000 | 166.98 | 232.1 | 125.88 |
| 1999 | 4.39 | 8.48 | 0.69 |
| 1998 | 0.52 | 0.69 | 0.39 |
| 1997 | 0.56 | 0.77 | 0.35 |