Frequencies for first 10,000 rows of importdate variable in rate2014 dataset :

        Import Date |      Freq.     Percent        Cum.
--------------------+-----------------------------------
2013-06-04 08:25:28 |        552        5.52        5.52
2013-08-01 12:48:00 |        414        4.14        9.66
2013-09-02 11:39:25 |        288        2.88       12.54
2014-01-21 08:29:49 |        322        3.22       15.76
2014-03-19 07:06:49 |        144        1.44       17.20
2014-04-18 11:49:29 |      8,280       82.80      100.00
--------------------+-----------------------------------
              Total |     10,000      100.00

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