| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.95 | 2.26 | 1.62 |
| 2024 | 1.97 | 3.06 | 1.42 |
| 2023 | 3.43 | 4.48 | 1.5 |
| 2022 | 2.33 | 5.06 | 0.8 |
| 2021 | 0.69 | 0.97 | 0.5 |
| 2020 | 0.87 | 1.09 | 0.62 |
| 2019 | 1.19 | 1.45 | 0.96 |
| 2018 | 1.6 | 2.04 | 1.11 |
| 2017 | 2.24 | 2.77 | 1.67 |
| 2016 | 2.71 | 3.55 | 2.14 |
| 2015 | 4 | 6.74 | 2.79 |
| 2014 | 3.18 | 4.29 | 2.61 |
| 2013 | 2.91 | 3.65 | 2.39 |
| 2012 | 3.55 | 4.51 | 2.77 |
| 2011 | 912.15 | 4660.27 | 3.6 |
| 2010 | 0 | ||
| 2009 | 0 | ||
| 2008 | 0 | ||
| 2007 | 0 | ||
| 2006 | 0 | -0.92 | |
| 2005 | 2.65 | 4.98 | 1.86 |
| 2004 | 3.3 | 5.16 | 1.8 |
| 2003 | 4.65 | 5.37 | 3.39 |
| 2002 | 5.54 | 7.63 | 2.81 |
| 2001 | 5.33 | 6.66 | 3.56 |
| 2000 | 5.12 | 6.12 | 3.14 |
| 1999 | 2.98 | 4.36 | 2.14 |
| 1998 | 3.26 | 4.39 | 2.73 |
| 1997 | 3.8 | 5.83 | 2.87 |