| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.52 | 2.12 | 1.32 |
| 2024 | 1.42 | 1.85 | 1.05 |
| 2023 | 1.71 | 2.13 | 1.35 |
| 2022 | 1.93 | 3.76 | 1.07 |
| 2021 | 1.08 | 1.47 | 0.85 |
| 2020 | 0.99 | 1.35 | 0.88 |
| 2019 | 1.14 | 1.64 | 0.87 |
| 2018 | 1.17 | 1.58 | 0.79 |
| 2017 | 2.16 | 2.88 | 1.44 |
| 2016 | 2.51 | 3.15 | 2.21 |
| 2015 | 3.06 | 6.1 | 1.53 |
| 2014 | 1.48 | 1.78 | 1.27 |
| 2013 | 1.6 | 2.16 | 1.31 |
| 2012 | 1.88 | 2.58 | 1.38 |
| 2011 | 0 | ||
| 2010 | 24.56 | 150.74 | 12.36 |
| 2009 | 6.47 | 18.97 | 1.75 |
| 2008 | 2.69 | 4.37 | 1.38 |
| 2007 | 2.41 | 3.64 | 0.89 |
| 2006 | 0.9 | 1.14 | 0.74 |
| 2005 | 0.72 | 0.89 | 0.51 |
| 2004 | 1.22 | 1.67 | 0.67 |
| 2003 | 1.79 | 3 | 1.27 |
| 2002 | 2.41 | 2.72 | 1.8 |
| 2001 | 3.25 | 3.82 | 2.24 |
| 2000 | 4.36 | 8.22 | 3.15 |
| 1999 | 5.18 | 8.7 | 3.76 |
| 1998 | 5.09 | 7.03 | 3.67 |