| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.67 | 0.79 | 0.59 |
| 2024 | 0.57 | 0.9 | 0.39 |
| 2023 | 0.81 | 0.9 | 0.71 |
| 2022 | 0.9 | 1.09 | 0.8 |
| 2021 | 1.13 | 1.54 | 0.82 |
| 2020 | 0.93 | 1.17 | 0.82 |
| 2019 | 1.19 | 1.56 | 1.04 |
| 2018 | 1.62 | 2.38 | 1.11 |
| 2017 | 3.19 | 4.01 | 2.29 |
| 2016 | 29.58 | 122.41 | 3.44 |
| 2015 | 34.14 | 107.89 | 15.17 |
| 2014 | 19.75 | 28.57 | 12.18 |
| 2013 | 25.54 | 54.46 | 16.58 |
| 2012 | 29.44 | 38.04 | 21.33 |
| 2011 | 32.46 | 40.9 | 22.68 |
| 2010 | 45.42 | 97.68 | 22.58 |
| 2009 | 40.02 | 85.81 | 8.63 |
| 2008 | 11.81 | 22.21 | 5.62 |
| 2007 | 8.94 | 14.92 | 2.33 |
| 2006 | 2.24 | 3.2 | 1.19 |
| 2005 | 1.11 | 1.47 | 0.69 |
| 2004 | 1.69 | 2.59 | 0.94 |
| 2003 | 2.27 | 2.68 | 1.83 |
| 2002 | 3.93 | 5.6 | 3.04 |
| 2001 | 6.98 | 9.3 | 4.46 |
| 2000 | 8.64 | 10.84 | 4.54 |
| 1999 | 5.25 | 7.5 | 4.11 |
| 1998 | 6.45 | 8.19 | 5.05 |