Appox. usage (any sense): 70 per million words
Appox. usage (any sense): 2.37 per million words
Appox. usage (any sense): 20.6 per million words
Appox. usage (any sense): 5.8 per million words
Appox. usage (any sense): 3.17 per million words
Appox. usage (any sense): less than 0.1 per million words