SPY options volume

Hi all,

I'm trying to find out what's the daily trading volume on the SPY options?
I've seen number at Yahoo!Finance and Nasdaq, but they seemed to be a bit low...
It was about 200K on 08/19/16, just coupe of days ago.
Does it make any sense? I was expecting for the volume to be much higher...

Thanks,
Guy

 

http://www.optionsclearing.com/webapps/volume-query

Not sure if this gives number of contracts traded or volume. Volume is double the number of contracts.

 

This is a screenshot of a Livevol window, for the SPY.
Hope this helps.