Frequencies for first 10,000 rows of importdate variable in rate2016 dataset :

        Import Date |      Freq.     Percent        Cum.
--------------------+-----------------------------------
2015-05-01 02:23:41 |        552        5.52        5.52
2015-07-08 02:47:08 |        138        1.38        6.90
2015-07-10 02:19:03 |        576        5.76       12.66
2015-08-22 15:09:32 |      1,624       16.24       28.90
2015-08-25 05:06:23 |        138        1.38       30.28
2015-10-20 04:38:50 |        154        1.54       31.82
2016-04-04 11:25:42 |      6,818       68.18      100.00
--------------------+-----------------------------------
              Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 6 Oct 2016