| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.74 | 1.92 | 1.5 |
| 2024 | 1.66 | 2.14 | 1.15 |
| 2023 | 2.59 | 4.16 | 1.85 |
| 2022 | 2.37 | 5.03 | 1.23 |
| 2021 | 2.33 | 3.87 | 1.67 |
| 2020 | 2.02 | 2.54 | 1.65 |
| 2019 | 2 | 2.65 | 1.56 |
| 2018 | 1.86 | 2.59 | 1.53 |
| 2017 | 5.43 | 8.89 | 2.32 |
| 2016 | 5.6 | 6.86 | 4.21 |
| 2015 | 5.08 | 10.73 | 2.66 |
| 2014 | 2.65 | 4 | 1.62 |
| 2013 | 1.81 | 2.17 | 1.5 |
| 2012 | 2.02 | 2.7 | 1.28 |
| 2011 | 3.24 | 4.91 | 2.13 |
| 2010 | 2.33 | 3.18 | 1.63 |
| 2009 | 1.83 | 2.55 | 1.08 |
| 2008 | 1.87 | 3.85 | 0.76 |
| 2007 | 3.07 | 4.66 | 1.45 |
| 2006 | 1.44 | 1.65 | 1.24 |
| 2005 | 1.5 | 1.97 | 1.08 |
| 2004 | 2.45 | 4.39 | 1.87 |
| 2003 | 3.59 | 4.06 | 3.1 |
| 2002 | 4.27 | 5.09 | 2.88 |
| 2001 | 5.01 | 5.93 | 3.51 |
| 2000 | 7.23 | 8.27 | 5.86 |
| 1999 | 5 | 6.8 | 3.03 |