Appox. usage (any sense): 382 per million words
Appox. usage (any sense): 144 per million words
Appox. usage (any sense): 51.8 per million words
Appox. usage (any sense): 56.3 per million words
Appox. usage (any sense): 0.117 per million words
Appox. usage (any sense): 1.93 per million words