The statistic I would like to see is the following:  the percentage of women appointed during this same period of time for 'open' board positions that were filled during that same period of time.  The additional 3% from 11% to 14% could actually represent more than 50% of new appointments meaning boards are aggressively working on the problem.  Or, conversely, it could be a very negative number if it is only 15% of new or open board appointments.  In the absence of this information we don't know if this is very fast change or slow change.