GPU running at 99% all the time

I do not know if this should cause alarm but I do not understand why my GPU is constantly running at 99% all the time. I do not experience any problems such as overheating or lagging but it never goes down from 99%. My pc has an intel CPU of 4.5 GHz and an Nvidia GTX GeForce 660 TI 2 gigs graphics card. Is this something I should be concerned about? Should I get a better graphics card? If yes, which one is it?
