2016 Phoenix area home sales strong over 2015

Since the final year end numbers won't be available for several weeks, I wanted to compare and contrast year to date and the Month of November 2015 vs 2016
 
Long story short- please take a look at the graph.
2015 and 2016 started off very similar until about July 2016 when the sales of homes started to sky rocket over 2015. Each of the months following, 2016 increased drastically over 2015.
 
From being out in the field, I can say that I have seen an increase of showings and purchases in the past several months.
nov-sales-vs-last-year