Australia have already won the first 3 Tests of this Ashes and most of us already saw how they destroyed England team in these 3 Tests but this stat will give you an idea about the damage done:
After 3 Tests Australian bowlers combined Average is 22.45 with Economy 2.72 and Strike Rate 49.5. Now look at English bowlers combined Average of 49.97 with Economy 3.62 and Strike Rate 82.6
The difference in average is 27.52, Difference in economy is 0.90 and difference in Strike Rate is 33.1