In 25 years, the asset went from 15 to 31-42.

(31/15)^(1/25)= 1.02946 or 2.946% CAGR (42/15)^(1/25)= 1.04204 or 4.204% CAGR

Of course, a CAGR to 3 decimal places is absurd when your asset value has a value of $36.5+/- 15%.

Looking at the numbers I'd have guessed "3-4%/yr" The notation I used is what you'd plug into a spreadsheet, FYI.

In 25 years, the asset went from 15 to 31-42.

(31/15)^(1/25)= 1.02946 or 2.946% CAGR
(42/15)^(1/25)= 1.04204 or 4.204% CAGR

Of course, a CAGR to 3 decimal places is absurd when your asset value has a value of $36.5+/- 15%.

Looking at the numbers I'd have guessed "3-4%/yr" The notation I used is what you'd plug into a spreadsheet, FYI.