Spam? Block Works!

I set Spam? blocker to block all (high, medium, & low) which is working.  Thank-you.  My call history shows that of the 32 robocalls received in the last 30 days, 21 were blocked.  And for some reason, the total calls have dropped 62%, from 85 a month last year.  Has someone in the world-wide telephone system found a way to block a lot of them at their source or am I just in a lucky streak?