U.S. death rate from Alzheimer’s rose dramatically over 15 years. Why?

https://www.washingtonpost.com/news/to-your-health/wp/2017/05/26/u-s-death-rate-for-alzheimers-rose-dramatically-over-15-years-why/

The CDC report estimates that 13.8 million Americans could be living with Alzheimer’s by 2050.