| 单位：% | |||||
| 年份 | 美元 | 英镑 | 日元 | 欧元 | 其他货币 |
| 1999 | 71.0 | 2.9 | 6.4 | 17.9 | 1.8 |
| 2000 | 71.1 | 2.8 | 6.1 | 18.3 | 1.7 |
| 2001 | 71.5 | 2.7 | 5.0 | 19.2 | 1.6 |
| 2002 | 67.1 | 2.8 | 4.4 | 23.8 | 1.9 |
| 2003 | 65.9 | 2.8 | 3.9 | 25.2 | 2.2 |
| 2004 | 65.9 | 3.4 | 3.8 | 24.8 | 2.1 |
| 2005 | 66.9 | 3.6 | 3.6 | 24.0 | 1.9 |
| 2006 | 65.5 | 3.4 | 3.1 | 25.1 | 2.9 |
| 2007 | 64.1 | 4.7 | 2.9 | 26.3 | 2.0 |
| 2008 | 63.8 | 4.2 | 3.5 | 26.2 | 2.3 |
| 2009 | 62.0 | 4.2 | 2.9 | 27.7 | 3.1 |
| 2010 | 61.8 | 3.9 | 3.7 | 26.0 | 4.6 |
| 2011 | 62.4 | 3.8 | 3.6 | 24.7 | 5.5 |
| 2012 | 61.1 | 4.0 | 4.1 | 24.3 | 6.6 |
| 2013 | 61.4 | 3.9 | 3.9 | 24.2 | 6.6 |
| 2014 | 62.9 | 3.8 | 3.7 | 22.2 | 7.4 |
| 2015 | 64.1 | 4.1 | 4.2 | 19.9 | 7.7 |
| 2016 | 62.9 | 4.4 | 4.2 | 19.7 | 8.8 |
| 2017 | 63.8 | 4.4 | 4.6 | 19.9 | 7.3 |