Charging percentage

It would be nice to have a column in the charging tables that displays the percentage of total kwh charged at this location. Ie. Home = 48% of all charged kwh added at this location.  Also a general percentage for the categories, like "CHAdeMO = 22% of all kWh charged at CHAdeMO-chargers". This data is available, but has to be calculated manually for now. 

A pie-chart of the categories at the right side of the screen would also be nice. Should be divided into "Home AC", "Other AC", "CHAdeMO" and "Supercharger".