This is a bunk chart. Its classically misleading because one axis starts at $10.00 and ends at $20, and the other starts at 0. Its skews the data to support a narrative.

https://imgur.com/a/foKA85V here is a guesstimated chart I made matching up the values as I don’t have the underlying data. As you can see more clearly, prices stayed relatively flat, climbing only marginally with inflation until recent heavily inflation years.