| 序号 | 时间 (年) |
数据 (美元) |
|---|---|---|
| 1 | 2023 | |
| 2 | 2022 | |
| 3 | 2021 | |
| 4 | 2020 | |
| 5 | 2019 | |
| 6 | 2018 | |
| 7 | 2017 | 37434.20 |
| 8 | 2016 | 37448.76 |
| 9 | 2015 | 36843.79 |
| 10 | 2014 | 36478.33 |
| 11 | 2013 | 35518.97 |
| 12 | 2012 | 34238.84 |
| 13 | 2011 | 33956.02 |
| 14 | 2010 | 32881.90 |
| 15 | 2009 | 32489.98 |
| 16 | 2008 | 33885.32 |
| 17 | 2007 | 33595.98 |
| 18 | 2006 | 31739.77 |
| 19 | 2005 | 30035.51 |
| 20 | 2004 | 29566.85 |
| 21 | 2003 | 28207.87 |
| 22 | 2002 | 28514.80 |
| 23 | 2001 | 28195.67 |
| 24 | 2000 | 30323.78 |
| 25 | 1999 | 30029.32 |
| 26 | 1998 | 29893.37 |
| 27 | 1997 | 29396.86 |
| 28 | 1996 | 29079.17 |
| 29 | 1995 | 28211.27 |
| 30 | 1994 | 27480.77 |
| 31 | 1993 | 26648.57 |
| 32 | 1992 | 26521.77 |
| 33 | 1991 | 26395.58 |
