| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.13 | 3.73 | 2.69 |
| 2024 | 2.97 | 3.74 | 2.4 |
| 2023 | 3.57 | 4.82 | 2.9 |
| 2022 | 3.49 | 6.09 | 2.69 |
| 2021 | 5.09 | 6.19 | 4.16 |
| 2020 | 5.21 | 8.82 | 3.9 |
| 2019 | 5.15 | 6.69 | 4.23 |
| 2018 | 5.33 | 7.01 | 3.61 |
| 2017 | 8.46 | 13.39 | 5.3 |
| 2016 | 10.04 | 14.47 | 7.95 |
| 2015 | 13.29 | 21.55 | 8.46 |
| 2014 | 6.72 | 11.92 | 4.14 |
| 2013 | 4.15 | 6 | 3.02 |
| 2012 | 4.08 | 5.3 | 3.18 |
| 2011 | 4.73 | 6.17 | 3.66 |
| 2010 | 6.73 | 9.04 | 4.94 |
| 2009 | 6.14 | 8.02 | 3.49 |
| 2008 | 12.64 | 32.65 | 2.12 |
| 2007 | 15.42 | 30.75 | 4.69 |
| 2006 | 3.39 | 4.9 | 2.21 |
| 2005 | 2.1 | 2.63 | 1.62 |
| 2004 | 3.18 | 5.22 | 2.27 |
| 2003 | 4.04 | 4.66 | 3.12 |
| 2002 | 5.29 | 6.08 | 4.12 |
| 2001 | 6.79 | 10.37 | 5.05 |
| 2000 | 10.11 | 12.34 | 6.66 |
| 1999 | 5.76 | 8.5 | 4.36 |