| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.84 | 0.88 | 0.77 |
| 2024 | 0.79 | 1.07 | 0.65 |
| 2023 | 0.88 | 1.02 | 0.79 |
| 2022 | 0.86 | 1.1 | 0.73 |
| 2021 | 1.17 | 1.33 | 1.02 |
| 2020 | 1.45 | 1.85 | 1.24 |
| 2019 | 1.42 | 1.84 | 1.02 |
| 2018 | 1.34 | 2.15 | 0.79 |
| 2017 | 2.15 | 2.33 | 1.97 |
| 2016 | 2.41 | 3.35 | 2.1 |
| 2015 | 35.09 | 198.24 | 1.74 |
| 2014 | 5.9 | 20.58 | 3.8 |
| 2013 | 3.88 | 5.15 | 3.16 |
| 2012 | 3.96 | 5.48 | 2.76 |
| 2011 | 7.79 | 10.42 | 4.08 |
| 2010 | 9.02 | 12.08 | 6.75 |
| 2009 | 5.79 | 9.43 | 2.81 |
| 2008 | 5.15 | 11.48 | 2.13 |
| 2007 | 5.5 | 9.73 | 2.27 |
| 2006 | 2.33 | 3.24 | 1.8 |
| 2005 | 1.88 | 2.54 | 1.45 |
| 2004 | 2.96 | 3.82 | 2.32 |
| 2003 | 3.57 | 4.43 | 2.74 |
| 2002 | 5.26 | 6.27 | 3.93 |
| 2001 | 7.15 | 8.28 | 5.34 |
| 2000 | 5.73 | 8.57 | 3.43 |
| 1999 | 3.79 | 4.65 | 2.97 |
| 1998 | 3.67 | 4.48 | 2.63 |