It looks like there won't be as many PPV's next year, so maybe it's their intention to not have Mighty Mouse as headliner any more. I'm basing this off the fact that UFC 200 is targeted for Independence Day weekend, meaning there will only be 5 PPV's between 194 and 200, when there's usually 7. 195 NYE, 196 Super Bowl, 199 Memorial Day.
I never knew your site existed. Looks interesting but navigation is a little difficult.
When comparing years by PPV success, it might be a good idea to make sure you only credit each year with one NYE show. The NYE show is typically a big event that does well on PPV, but it can fall in either late Dec or early Jan, helping or hurting certain years' PPV numbers. For example, 2014 wouldn't be credited with either Silva/Weidman 2 or Jones/Cormier.