| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 20.67 | 23.27 | 18.45 |
| 2024 | 12.38 | 23.69 | 4.8 |
| 2023 | 6.82 | 8.89 | 4.97 |
| 2022 | 4.47 | 8.06 | 1.11 |
| 2021 | 1.82 | 2.72 | 1.23 |
| 2020 | 2.29 | 3.47 | 1.46 |
| 2019 | 1.93 | 2.62 | 1.51 |
| 2018 | 2.89 | 3.41 | 1.88 |
| 2017 | 4.03 | 4.62 | 2.97 |
| 2016 | 3.24 | 4.46 | 2.32 |
| 2015 | 4.54 | 6.8 | 2.5 |
| 2014 | 2.58 | 5.79 | 1.76 |
| 2013 | 2.3 | 3.5 | 1.93 |
| 2012 | 2.73 | 3.85 | 2.21 |
| 2011 | 4.44 | 6.32 | 2.5 |
| 2010 | 4.19 | 6.2 | 2.88 |
| 2009 | 3.09 | 4.7 | 2.08 |
| 2008 | 2.41 | 4.41 | 1.42 |
| 2007 | 3 | 4.72 | 1.06 |
| 2006 | 1.07 | 1.45 | 0.82 |
| 2005 | 1.05 | 1.5 | 0.74 |
| 2004 | 1.91 | 2.73 | 1.38 |
| 2003 | 2.2 | 2.75 | 1.56 |
| 2002 | 2.97 | 3.43 | 2.35 |
| 2001 | 3.87 | 4.73 | 2.69 |
| 2000 | 11.54 | 21.13 | 9.24 |
| 1999 | 8.04 | 11.06 | 5.28 |
| 1998 | 5.82 | 10.28 | 3.65 |