How come Yes Bank's share price graph from 2005?

Yes Banks’s IPO happened in July 2020 but the graphs show its share price graph from mid-2005. Can anyone explain this? First-time investor here.

In July 2020, Yes Bank as part of their fund raising plan came up with FPO (Follow on Public Offer) which is different from IPO (Initial Public Offering), Yes Bank had it’s IPO in 2005, following which it was listed on stock exchanges.