For 682 pt b: Would you recommend for us to pull data comparing how filing times have fluctuated across different 10-year spans in order to affirm or reject the null hypothesis. For example if we intended to look at the period for 2006-2016 and found that filing times did improve, should we also look at the period from 1995-2005 or 2000-2010 to determine if the changes from 2006-2016 were significant?

Looking at several 10-year timeframes is a good idea and can be done by the industrious. Pick a 10-year period in the past and compare is all we are asking.