I just installed AIDA64 to test my phone.
The Wear Level of my phone battery is 0 %. And both Designed Capacity and Fully Charged Capacity have the same number (in my case 9500 mWh). I think AIDA shows that your battery is worn only 5 % and plenty of mileage left. I don't know how accurate this assumption is, however.
By the way, I was charging the battery when I checked the numbers. I don't know if it matters or not.
My battery model is BV-T5C
your battery's Designed Capacity is 2000mWh; you are currently maxing 1900mWh when fully charged (Fully Charged Capacity) - so:
1900mWh / 2000mWh = 95% of the designed capacity (or a 5% Wear Level)