The NR is controlled by the VARTOM and the control law is as follow:
For IAS<55KIAS, Nr= 101% up to 3600ft DA. Then it will increase up to 103.5% above 6500ft DA.
For IAS>55KIAS, Nr= 96.5% up to 3600ft DA. Then it will increase up to 101% above 8800ft DA.
For a given altitude, the Nr will slightly increase with airspeed. For example at Vh, Nr will go up to ~97% up to 3600ft DA and up to 102% above 8800ft DA.
So to answer your question, if you're at high DA (let say above 8800ft), the Nr will be at 103.5% in hover and up to 55KIAS, passing 55KIAS it will drop to 101%