Decreased Nuisance Calls?

I hate to ask this, but has anyone noticed a significant decrease in nuisance calls for February?

For the past 5 years, I've averaged 32 nuisance calls per month.  During February 2016, I only received 6.  It's down 81%.

I'm not bragging or complaining, but something has changed.  I don't think Cox did anything because it would be against their creed to protect us.  Could all of my nuisance calls have come from the same source and they've recently quit?  Did the FTC recently bust a company?

Hopefully this will be a trend!