Treasury exchange rates:

Currency: 2011 2010 2009 2008 2007 2006
Australian dollar 1.0332 0.9200 0.7927 0.8537 0.8391 0.7535
Canadian dollar 0.9887 1.0298 1.1412 1.0660 1.0734 1.1340
Chinese yuan 6.4630 6.7696 6.8307 6.9477 7.6058 7.9723
Euro 1.3931 1.3261 1.3935 1.4726 1.3711 1.2563
Japanese yen 79.70 87.78 93.68 103.39 117.76 116.31
Mexican peso 12.427 12.624 13.498 11.143 10.928 10.906
U.K. pound 1.6043 1.5452 1.5661 1.8545 2.0020 1.8434