There was big drop from Dec2021 to Jan2022 that skews the short term data.
Everyone who wanted to get vaccinated got vaccinated in 2021.
You need to look at the numbers in 2021 because that's the big vaccine rollout period. Jan21 to Jan22 was 1.8 million.
Besides, without cherrypicking the start points, it's easy to see the slope is steeply up.