Normalized stacked barchart is similiar to ordinary stacked barchart, only that it displays data in percentage, instead of the usual bar-height-by-value.
This example shows browser usage statistic from 2002 – 2016 (sorry, no 2017 data just yet). The data is from w3schools.
Hover on bar segment(s) to display data, use the slider below to choose year data.
I found it easier to hover on the smaller bar segments if the view is wider/larger, as you can see at my original fullwidth sample, by clicking on the button below.