The December average of atmospheric CO2 at Mauna Loa was 416.7 ppm, that's 2.45 ppm higher than last year. Overall, still speeding in the wrong direction! 
The 2021 average of atmospheric CO2 measured at Mauna Loa was 416.45 ppm. That's 2.21 ppm higher than last year, and 24.6 ppm higher than ten years before.
The increase in atmospheric CO₂ concentration will slow down once we reduce emissions. And concentration will start to go down sometime before we reach net-zero. This article says: once we reduced emissions by ~70% (carbonbrief.org/explainer-will…)
Since 2010, excess CO₂ in the atmosphere, i.e. the increase over pre-industrial concentration*, driving global warming, grew by 26.35/112.10 = 23.5%.
*) estimated to be 278 pppm
*) estimated to be 278 pppm
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