Frequencies for first 10,000 rows of pct013e031 variable in sf12010880us35 dataset :

  18 and 19 |
      years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,658       96.58       96.58
          1 |        288        2.88       99.46
          2 |         41        0.41       99.87
          3 |          7        0.07       99.94
          4 |          5        0.05       99.99
          7 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017