Frequencies for first 10,000 rows of pct012n054 variable in sf12000860us29 dataset :

   51 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,523       95.23       95.23
          1 |        352        3.52       98.75
          2 |         66        0.66       99.41
          3 |         25        0.25       99.66
          4 |         14        0.14       99.80
          5 |          2        0.02       99.82
          6 |          6        0.06       99.88
          8 |          3        0.03       99.91
         10 |          1        0.01       99.92
         11 |          2        0.02       99.94
         12 |          3        0.03       99.97
         18 |          1        0.01       99.98
         19 |          1        0.01       99.99
         22 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017