| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.82 | 2.23 | 1.48 |
| 2024 | 1.58 | 2.12 | 1.15 |
| 2023 | 2.43 | 2.86 | 1.98 |
| 2022 | 4.77 | 6.98 | 2.46 |
| 2021 | 3.07 | 5.09 | 1.6 |
| 2020 | 1.59 | 2.27 | 1.1 |
| 2019 | 1.72 | 3.47 | 1.24 |
| 2018 | 1.5 | 2.28 | 0.88 |
| 2017 | 1.9 | 2.88 | 1.32 |
| 2016 | 2.22 | 2.93 | 1.93 |
| 2015 | 10.46 | 22.41 | 2.35 |
| 2014 | 5.58 | 8.58 | 4.03 |
| 2013 | 5.62 | 9.88 | 3.54 |
| 2012 | 9.03 | 11.98 | 5.98 |
| 2011 | 10.36 | 16.07 | 6.4 |
| 2010 | 16.44 | 22.47 | 12.01 |
| 2009 | 11.6 | 17.29 | 5.02 |
| 2008 | 4.36 | 6.82 | 2.88 |
| 2007 | 3.54 | 5.08 | 1.98 |
| 2006 | 2.34 | 3.19 | 1.79 |
| 2005 | 2.12 | 2.95 | 1.51 |
| 2004 | 3.26 | 4.33 | 2.55 |
| 2003 | 3.83 | 5.12 | 2.63 |
| 2002 | 5.06 | 6.2 | 2.51 |
| 2001 | 5.23 | 6.83 | 3.75 |
| 2000 | 3.81 | 5.01 | 2.92 |
| 1999 | 3.23 | 4.34 | 2.52 |