| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 14.08 | 16.63 | 11.75 |
| 2024 | 12.14 | 19.21 | 8.9 |
| 2023 | 11.71 | 14.33 | 9.52 |
| 2022 | 14.61 | 26.86 | 9.11 |
| 2021 | 12.44 | 32.6 | 6.54 |
| 2020 | 5.31 | 8.14 | 3.08 |
| 2019 | 5.62 | 8.58 | 3.64 |
| 2018 | 7.5 | 11.8 | 3.98 |
| 2017 | 12.5 | 14.38 | 10.35 |
| 2016 | 13.08 | 15.73 | 8.47 |
| 2015 | 9.54 | 17.45 | 5.12 |
| 2014 | 4.64 | 7.31 | 2.24 |
| 2013 | 2.53 | 3.08 | 2.03 |
| 2012 | 2.54 | 3.16 | 1.87 |
| 2011 | 4.25 | 5.88 | 2.42 |
| 2010 | 4.09 | 5.32 | 3.22 |
| 2009 | 2.5 | 3.45 | 1.41 |
| 2008 | 2.53 | 4.9 | 1.1 |
| 2007 | 4.33 | 5.69 | 2.53 |
| 2006 | 2.1 | 2.93 | 1.51 |
| 2005 | 1.84 | 2.74 | 1.19 |
| 2004 | 3.24 | 4.31 | 2.42 |
| 2003 | 3.18 | 3.84 | 2.69 |
| 2002 | 5.03 | 5.92 | 3.35 |
| 2001 | 9.26 | 13.73 | 4.51 |
| 2000 | 5.34 | 8.24 | 3.23 |
| 1999 | 4.45 | 5.72 | 3.29 |
| 1998 | 4.87 | 6.48 | 3.4 |