Battery life degradation way to fast

Hello,

I've bought my iPhone 11 in November 2019 with 100% battery life.

About two months ago my battery life was at 98%.

I've checked today and I was shocked to see it was at 94%.

Is this normal? I think its degrading too fast, compared to my previous iPhone where after a year and a few months I was still at 98%.

I'm charging with the fast changer that comes with the iPhone 11 pro.

Thank you,