You can create a custom range of colors using the "rule based rendering" option in the Style tab of the layer properties. Create a set of rules, with the colors you choose (for the whole scale of possible values, 01-00 as you mention). Then save the style out to a QGIS style file (*.qgs). Now
Now you can load that style for all the other years (the "Locad"Load Style" button), and you'll have an identical color ramp for all the years.