| 序号 | 时间 (年) |
数据 (百万美元) |
|---|---|---|
| 1 | 2021 | |
| 2 | 2020 | |
| 3 | 2019 | |
| 4 | 2018 | |
| 5 | 2017 | |
| 6 | 2016 | |
| 7 | 2015 | 199.50 |
| 8 | 2014 | 268.20 |
| 9 | 2013 | 217.20 |
| 10 | 2012 | 238.60 |
| 11 | 2011 | 325.80 |
| 12 | 2010 | 298.10 |
| 13 | 2009 | 251.90 |
| 14 | 2008 | 240.50 |
| 15 | 2007 | 219.60 |
| 16 | 2006 | 131.30 |
| 17 | 2005 | 122.70 |
| 18 | 2004 | 125.10 |
| 19 | 1977 | 6.10 |
| 20 | 1976 | 5.40 |
| 21 | 1975 | 4.20 |
| 22 | 1974 | 3.60 |
| 23 | 1973 | 3.30 |
| 24 | 1970 | 2.90 |
