ENPROD contains the amount of energy produced (PRODUCED) for seven sources (ENGYTYPE) for two years (YEAR). The amounts of energy produced are in quadrillion btu.

data reflib.enprod;
   length engytype $ 8;
   input year engytype produced;
   datalines;
1985 Coal      19.33
1985 Gas       19.22
1985 Petro     18.99
...more data lines...
1995 Hydro      3.21
1995 Geotherm    .31
1995 Biofuels   2.95
;