| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.81 | 3.34 | 2.56 |
| 2024 | 1.8 | 3.28 | 1.21 |
| 2023 | 1.99 | 2.4 | 1.76 |
| 2022 | 1.91 | 2.28 | 1.4 |
| 2021 | 1.79 | 2.54 | 1.28 |
| 2020 | 1.74 | 2.69 | 1.34 |
| 2019 | 2.02 | 2.93 | 1.59 |
| 2018 | 2.12 | 3.5 | 1.25 |
| 2017 | 3.59 | 4.32 | 3.01 |
| 2016 | 6.75 | 14.97 | 3.62 |
| 2015 | 17.62 | 33.78 | 8.9 |
| 2014 | 8.72 | 16.35 | 5.36 |
| 2013 | 4.25 | 6.57 | 2.98 |
| 2012 | 3.92 | 5.25 | 2.89 |
| 2011 | 6.56 | 12.91 | 3.19 |
| 2010 | 10.44 | 14.37 | 7.23 |
| 2009 | 8.18 | 11.64 | 4.86 |
| 2008 | 6.79 | 12.38 | 4.01 |
| 2007 | 0 | ||
| 2006 | 0 | -0.6 | |
| 2005 | 836.28 | 939.52 | 615.16 |
| 2004 | 229.87 | 995.44 | 3.27 |
| 2003 | 6.08 | 9.42 | 3.23 |
| 2002 | 8.41 | 10.74 | 4.08 |
| 2001 | 9.16 | 11.11 | 6.01 |
| 2000 | 16.76 | 20.65 | 10.06 |
| 1999 | 7.96 | 13.16 | 4.11 |
| 1998 | 3.44 | 4.17 | 2.75 |
| 1997 | 4.32 | 6.4 | 3.06 |