| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 1.44 | 1.59 | 1.26 |
| 2025 | 1.33 | 1.73 | 1.18 |
| 2024 | 1.39 | 1.65 | 1.13 |
| 2023 | 1.81 | 2.17 | 1.46 |
| 2022 | 2.15 | 2.59 | 1.88 |
| 2021 | 2.75 | 3.36 | 2.34 |
| 2020 | 3.84 | 6.03 | 2.95 |
| 2019 | 5.55 | 10.11 | 3.31 |
| 2018 | 3.81 | 4.76 | 2.69 |
| 2017 | 4.9 | 7.62 | 3.06 |
| 2016 | 5.29 | 6.93 | 4.07 |
| 2015 | 47.22 | 145.4 | 6.12 |
| 2014 | 16.85 | 28.25 | 12.86 |
| 2013 | 13.97 | 17.43 | 11.14 |
| 2012 | 16.59 | 21.06 | 11.53 |
| 2011 | 25.41 | 34.22 | 15.83 |
| 2010 | 29.39 | 40.22 | 21.53 |
| 2009 | 23.72 | 28.65 | 14.72 |
| 2008 | 23.01 | 48.68 | 8.07 |
| 2007 | 31.25 | 51.47 | 8.07 |
| 2006 | 11.12 | 13.93 | 7.56 |
| 2005 | 6.99 | 9.62 | 4.76 |
| 2004 | 11.92 | 20.12 | 6.72 |
| 2003 | 21.96 | 28.04 | 12.08 |
| 2002 | 28.1 | 36.14 | 18.2 |
| 2001 | 24.13 | 27.4 | 19.47 |
| 2000 | 9.19 | 12.48 | 6.69 |
| 1999 | 3.68 | 5.03 | 2.58 |
| 1998 | 3.19 | 4.07 | 2.13 |
| 1997 | 2.45 | 3.58 | 2 |