XY graph or waveformchart with time stamp on x axis

Hi:

I am trying to use a waveform chart or an xy graph to plot the Power (y axis) vs the time stamp (x axis), the time stamp is created by the data from excel,  my problem is that when I run the VI appears only one point in the two graphs, it change its value every loop but it stay on the same position, I want that the data generates a curve with the time stamp for every value of the Power.

I had tried with property nodes but it did not work. I attached my VI and one excel example.

Best regards.