Power BI Using data from an excel on sharepoint : How to refresh automatically the excel ?

Hello everyone, 

I use Power BI and I love it ! 

As a data source I use an excel file stored in a sharepoint folder. 

The excel sheet pull data from an "intranet" website.

I would like to refresh data automatically "every hour" without opening the excel file. 

Here's a sample of the excel sheet : 

Thanks in advance, 

Zakaria