why did you use 2 different time scales? why not 10 or 3 years for both? What is the 10 year increase 2015 to 2025?

edit: I looked up the answer to my question. NOAA reported 25 ppm increase 2015 to 2025, from 400 parts per million (ppm) to over 425 ppm. (A 25% increase from 1980s)

NOAA has nice charts of ppm growth rate by year and decade https://gml.noaa.gov/ccgg/trends/gr.html