Hello Sandeep
Remember, that these values are referring to bandwidth guarantees that exist during congestion. In other words, this is reserved bandwidth for that particular type of traffic.
Now if there is no AF11, AF21, and AF31 traffic at a particular time, then all other configured traffic types (EF and class-default) will share the full bandwidth of the interface as needed. But such traffic will be served in a best-effort manner, no guaranteed bandwidth is provided beyond what has been configured.
So if you were to examine the results of such a situation in the lab, you would see that any additional bandwidth available would show up under the class-default.
But be aware that this is not guaranteed bandwidth that you are seeing, but best effort.
I hope this has been helpful!
Laz
Remember, when configuring these values (whether percentage or percentage remaining) they define the minimum guaranteed bandwidth