T4 - Power value error

In literature, the maximum power usage of t4 is 70W. T4 using through google cloud, getting maximum power usage 94W. In benchmarking, I get this graph (link:https://drive.google.com/file/d/1_iT5W2qh-R0eiTEPUoJl1-gTjoe5hMDx/view?usp=sharing). Every time I am seeing this power variation. What is the reason for this difference?