Date	Rate
2017/6/12	0.188
2017/6/9	0.180
2017/6/8	0.179
2017/6/7	0.181
2017/6/6	0.179
2017/6/5	0.177
2017/6/3	0.180
2017/6/2	0.181
2017/6/1	0.181
2017/5/31	0.179
2017/5/26	0.177
2017/5/25	0.171
2017/5/24	0.170
2017/5/23	0.170
2017/5/22	0.171
2017/5/19	0.172
2017/5/18	0.174
2017/5/17	0.173
2017/5/16	0.176
2017/5/15	0.174