| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 32.97 | 38.16 | 27.88 |
| 2024 | 42.32 | 90.61 | 9.82 |
| 2023 | 9.78 | 28.13 | 2.06 |
| 2022 | 24.42 | 28.71 | 17.49 |
| 2021 | 26.45 | 45.85 | 11.78 |
| 2020 | 27.36 | 35.61 | 22.32 |
| 2019 | 90.19 | 115.55 | 60.93 |
| 2018 | 21.04 | 80.67 | 0.64 |
| 2017 | 2.83 | 3.51 | 2.28 |
| 2016 | 3.7 | 4.38 | 3.21 |
| 2015 | 3.74 | 7.54 | 2.56 |
| 2014 | 19.56 | 40.77 | 2.52 |
| 2013 | 11.79 | 16.16 | 5.86 |
| 2012 | 5.41 | 6.65 | 4.01 |
| 2011 | 7.39 | 9.14 | 5.22 |
| 2010 | 6.91 | 8.94 | 4.61 |
| 2009 | 4.88 | 7.27 | 2.84 |
| 2008 | 4.13 | 9.57 | 2.01 |
| 2007 | 12.23 | 34.36 | 3.95 |
| 2006 | 2.52 | 5.13 | 1.08 |
| 2005 | 0.25 | 1.14 | 0.03 |
| 2004 | 0.1 | 0.15 | 0.07 |
| 2003 | 0.68 | 2.09 | 0.12 |
| 2002 | 1.93 | 2.31 | 1.32 |
| 2001 | 1.34 | 2.68 | 0.41 |
| 2000 | 0.14 | 0.33 | 0.06 |
| 1999 | 0.03 | 0.04 | 0.02 |
| 1998 | 0.02 | 0.02 | 0.01 |
| 1997 | 0.03 | 0.04 | 0.02 |