The analysis omits to examine the incidence of high-carb related diseases such as diabetes and metabolic syndrome, which have been increasing over the same time. Many of the charts in the article only go back a decade whereas the 'fat is bad' lie goes back to the 70s. Maybe the very slight changes shown in the charts means we are just beginning to wake up to the problem. The assertion it is down to lack of exercise or thermostats falls down when you have newborns and toddlers that are obese. Are they not exercising enough and has their environment really changed that much in the past decade or two? Switching to a low-carb-high-fat (LCHF) diet means you are burning fat to maintain body temperature, the equivalent of an hour's workout on a high-carb diet, just by living! I am not alone in experiencing significant weight loss having gone LCHF, eating when I am hungry and achieving satiation; 20kg loss in just over a year in my case and now enjoying a stable weight on the same intake. BMI is right in the middle of the normal range, height/waist is perfect (had to buy whole new wardrobe though!) 10yr CHD risk is just 4% (avg for my age 14%) all other health indicators very good.
So this article is trying to find statistics to say, "actually chaps we're OK" when the nation's health is far from it. Look at this from first principles. Look at the bio-chemistry of the effect of carbohydrate consumption on insulin, grehlin, leptin, liver function, kidney function, salt excretion and the headline-grabbing cholesterol that Big Pharma would love to resolve by selling even more statins.