How special is oral argument?

On the COA's oral argument calendar, it is common that a panel hear all of its cases without oral argument. So when a lawyer's case is scheduled for oral argument, it feels like a special accomplishment. But how special is oral argument?

In 2015, 1021 cases appeared on a COA calendar, 139 or 14% were scheduled for oral argument.

Total Cases 2015
30(f)
Orally Argued 
% 30(f)
% Orally Argued 
1021
882
139
86%
14%