Appox. usage (any sense): 130 per million words
Appox. usage (any sense): 8.4 per million words
Appox. usage (any sense): 0.231 per million words
Appox. usage (any sense): 3.9 per million words
Appox. usage (any sense): 0.015 per million words
Appox. usage (any sense): less than 0.1 per million words