| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.6 | 6.48 | 4.82 |
| 2024 | 4.18 | 7.2 | 3.21 |
| 2023 | 4.73 | 7.04 | 3.23 |
| 2022 | 5.67 | 6.59 | 4.49 |
| 2021 | 8.06 | 11.24 | 4.83 |
| 2020 | 11.7 | 14.59 | 8.61 |
| 2019 | 13.6 | 16.15 | 10.4 |
| 2018 | 10.57 | 12.82 | 7.93 |
| 2017 | 12.83 | 15.79 | 11.84 |
| 2016 | 18.04 | 27.25 | 13.12 |
| 2015 | 18.11 | 31.99 | 5.67 |
| 2014 | 9.03 | 20.74 | 5.4 |
| 2013 | 28.62 | 43.85 | 19.85 |
| 2012 | 11.21 | 18.98 | 5.48 |
| 2011 | 10.29 | 16.12 | 5.64 |
| 2010 | 14.29 | 23.95 | 8.77 |
| 2009 | 19.69 | 32.23 | 6.09 |
| 2008 | 14.86 | 34.91 | 4.95 |
| 2007 | 28.01 | 39.08 | 22.41 |
| 2006 | 15.62 | 22.45 | 8.94 |
| 2005 | 5.17 | 9.1 | 2.77 |
| 2004 | 6.13 | 8.96 | 4.34 |
| 2003 | 7.05 | 7.98 | 6.35 |
| 2002 | 8.49 | 10.51 | 6.77 |
| 2001 | 9.6 | 15.41 | 3.82 |
| 2000 | 0 | -1.21 | |
| 1999 | 26.5 | 56.62 | 6.94 |
| 1998 | 3.27 | 4.73 | 2.09 |
| 1997 | 4.72 | 6.5 | 3.25 |