Frequencies for first 10,000 rows of proc52d variable in namcs1993 dataset :

 service #5 |
  procedure |
   code - 2 |
     digits |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,987       99.87       99.87
         03 |          2        0.02       99.89
         49 |          1        0.01       99.90
         87 |          2        0.02       99.92
         88 |          1        0.01       99.93
         89 |          3        0.03       99.96
         93 |          1        0.01       99.97
         94 |          1        0.01       99.98
         99 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016