The cost of Thanksgiving dinner

There's a lot of discussion about inflation and the cost of Thanksgiving dinner. Farm Bureau tracks this and my figures are from that website. The 2020 dinner for 10 was $46.90, a decrease from 2019 which was $48.91.

The 2021 dinner for 10 is $53.31, up 14% over 2020, which was the Covid year, and a decrease from 2019. However, the 2017 cost was $49.12, or 23.1% cheaper that 1986 ($63.87 in 2017 dollars).

I'm math challenged, so will some genius tell me if the 2021 dinner is cheaper than 1986? No matter how you slice it, it's still a good deal.