That chart just doesn't correspond to what I see in day to day life. The idea that the consumption of sugar peaked in around 1997 and then went down just does not seem plausible. I see way more sugar consumption all around me.

Now, if they're JUST talking table sugar, then maybe. But if so, it's completely blown away by the consumption of sugar in processed foods - which for a lot of people is every day, all the time.