Frequencies for first 10,000 rows of importdate variable in bencs2016 dataset :

        Import Date |      Freq.     Percent        Cum.
--------------------+-----------------------------------
2015-05-01 02:23:41 |        180        1.80        1.80
2015-05-09 02:20:02 |         54        0.54        2.34
2015-07-08 02:47:08 |          9        0.09        2.43
2015-07-09 13:17:42 |         27        0.27        2.70
2015-07-10 02:19:03 |         72        0.72        3.42
2015-07-11 04:19:24 |         54        0.54        3.96
2015-08-18 03:25:03 |          9        0.09        4.05
2015-08-22 15:09:32 |      1,355       13.55       17.60
2015-08-25 05:06:23 |         32        0.32       17.92
2015-08-27 11:14:25 |        360        3.60       21.52
2016-04-04 11:25:42 |      7,848       78.48      100.00
--------------------+-----------------------------------
              Total |     10,000      100.00

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