Appox. usage (any sense): 18.1 per million words
Appox. usage (any sense): 0.36 per million words
Appox. usage (any sense): 0.219 per million words
Appox. usage (any sense): 0.168 per million words
Appox. usage (any sense): 0.021 per million words
Appox. usage (any sense): less than 0.1 per million words