\begin{tabular}{rrrr}
  \hline
  Method & 
  Compression Ratio & 
  Compression Time & 
  Decompression Time \\
  \hline
  a & 24.00 & 10.84 & 10.00 \\
  aaa & 0.00 & 0.00 & 0.00 \\
  alphabet & 0.01 & 0.00 & 0.00 \\
  random & 6.60 & 0.00 & 0.00 \\
\end{tabular}
\caption{Results for dmc-16M (sorted by file)}