Appox. usage (any sense): 169 per million words
Appox. usage (any sense): 33.9 per million words
Appox. usage (any sense): 18 per million words
Appox. usage (any sense): 0.267 per million words
Appox. usage (any sense): 0.201 per million words
Appox. usage (any sense): 0.03 per million words