| 序号 | 时间 (年) |
数据 (亿美元) |
|---|---|---|
| 1 | 2020 | |
| 2 | 2019 | |
| 3 | 2018 | |
| 4 | 2017 | |
| 5 | 2016 | |
| 6 | 2015 | |
| 7 | 2014 | 2.92 |
| 8 | 2013 | 4.74 |
| 9 | 2012 | 4.89 |
| 10 | 2011 | 2.25 |
| 11 | 2010 | 1.05 |
| 12 | 2009 | 0.14 |
| 13 | 2008 | 0.14 |
| 14 | 2007 | 0.17 |
| 15 | 2006 | 0.18 |
| 16 | 2005 | 0.11 |
| 17 | 2004 | 0.03 |
| 18 | 2003 | 0.04 |
| 19 | 2002 | 0.02 |
| 20 | 2001 | 0.02 |
