| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.65 | 2.29 | 1.3 |
| 2024 | 1.61 | 2.26 | 1.18 |
| 2023 | 2.22 | 2.76 | 1.83 |
| 2022 | 2.16 | 3.67 | 1.65 |
| 2021 | 4.21 | 5.77 | 3.17 |
| 2020 | 5.74 | 7.25 | 4.41 |
| 2019 | 3.89 | 5.07 | 3.22 |
| 2018 | 4.73 | 6.82 | 3.48 |
| 2017 | 5.63 | 6.8 | 4.89 |
| 2016 | 7.43 | 9.91 | 5.18 |
| 2015 | 9.88 | 15.23 | 6.24 |
| 2014 | 6.26 | 7.15 | 5.61 |
| 2013 | 5.15 | 6 | 3.65 |
| 2012 | 3.95 | 4.41 | 3.19 |
| 2011 | 4.38 | 5.47 | 3.6 |
| 2010 | 4.14 | 5.29 | 3.24 |
| 2009 | 3.52 | 4.29 | 2.21 |
| 2008 | 4.27 | 8.22 | 1.57 |
| 2007 | 5.64 | 8.18 | 2.48 |
| 2006 | 2.24 | 3.36 | 1.37 |
| 2005 | 1.63 | 2.13 | 1.22 |
| 2004 | 3 | 4.15 | 1.6 |
| 2003 | 2.68 | 3.14 | 2 |
| 2002 | 4.49 | 5.74 | 3.67 |
| 2001 | 5.9 | 7.11 | 4.26 |
| 2000 | 5.31 | 5.99 | 4.18 |