He played 5 matches taking 6 wickets at an average of 6.82 per wicket.

In the season as a whole he took 94 wickets at an average of 22.10 runs per wicket.

He has an average of 20.70 runs per wicket.

He took 51 wickets in all that season, at an average of 7.51 runs per wicket.

He maintained a strike rate of 59.1 balls per wicket.

The average too, at 19.48 runs per wicket, was much reduced.

He took 347 wickets at an average cost of 21.62 per wicket.

He finished the series with seven wickets at an average of over 50 runs per wicket.

Johnson played in the first four Tests, taking 16 wickets at an average of 16.31 runs per wicket.

There are several of these, the key one being 'two minutes per wicket taken'.