Date	Rate
2012/6/1	0.523
2012/5/31	0.515
2012/5/30	0.519
2012/5/29	0.512
2012/5/28	0.511
2012/5/25	0.513
2012/5/24	0.514
2012/5/23	0.511
2012/5/22	0.512
2012/5/21	0.512
2012/5/18	0.511
2012/5/17	0.511
2012/5/16	0.512
2012/5/15	0.512
2012/5/14	0.513
2012/5/11	0.514
2012/5/10	0.514
2012/5/9	0.514
2012/5/8	0.513
2012/5/7	0.513