Produce the pie chart. The WHERE data set option subsets the data for 1995. OTHER=0 specifies that all midpoints, no matter how small, display a slice. MIDPOINTS= assigns the order of the slices. Each slice displays the percent contribution to total production and the slice name. VALUE=NONE suppresses the chart statistic. Both SLICE= and PERCENT= are assigned the ARROW labeling method to point to the slice, but only one arrow line is displayed. CFILL= specifies a color for the fill used by all slices. 
proc gchart data=reflib.enprod (where=(year=1995));
     pie engytype / sumvar=produced
                    other=0
                    midpoints='Coal' 'Geotherm' 'Petro'
                              'Biofuels' 'Gas' 'Nuclear'
                              'Hydro'
                    value=none
                    percent=arrow
                    slice=arrow
                    cfill=cyan
                    noheading;
run;
quit;