You cannot refute the fact that on average in the US premiums have gone up 131% in 20 years with the fact that yours have not gone up.
Damn, this isn't rocket science.
First, there are many people like me who chose to change insurers if their premiums went up more than they were comfortable with. I'm not the sole individual in this country who avoided large increases.
Next, we can play lots of games with statistics. The 131% .. how was it arrived at? Did all age groups go up 131%? Over 20 years I would suspect older people experienced higher rate increases as a percentage than younger (i.e. healthier) people. So did they take an average of every age ... from 21 to 65 (or higher)? Did they include everyone, from individuals to corporations in the study? Did they include Cadillac plans and high deductible policies? If so, was the average a weighted average based on the number of individuals in each (every) age group? I won't go on and on .... but with whatever raw data they used I bet I could come up with hundreds of different results as to what the percentage increase was over that time period.
Last, 131% isn't all that much over 20 years. It's just over 4% compounded whereas my rates have gone up just 1.5%.