There doesn't seem to be much pattern here, except that confidence shot up in the 9-11 response, another Spike happened in 2009 (Obama?) and is coming down to p

There doesn't seem to be much pattern here, except that confidence shot up in the 9-11 response, another Spike happened in 2009 (Obama?) and is coming down to pre-9-11 levels right now; following a downwards trend that was present over the last two decades outside of those two spikes. Maybe the headline should read "confidence in US military returns to normal levels"?