Just think about it.
We barely knew anything about covid or how to treat it at the start of the year. Now, it seems like we have a better understanding and how to potentially treat it.
Compare this to Influenza/Pneumonia, which I'm just guessing we've been studying for much longer and already have treatments for.
You could probably add some sort of moving average 50 days and 200 days to provide a clearer picture of how we are currently doing.