We derive all our values for the year 2015 because this is the one which we have data for. However, in some cases, the value in 2015 is predicated on expectations of increasing need for the spectrum in coming years. This is particularly true for mobile broadband where there is a prediction that more spectrum will be needed in the next decade due to growth in demand. Where these predictions are widely used, and hence likely to transpire, we use these to build a forward-looking element into our analysis.