[USER (data scientist)]: Great! I would like to construct a table that displays the yearly count of affordable properties sold, their average price, and the annual percentage change. Once this is completed, could you please answer the following question: From what time period is data missing in the dataset?  

A. 2015 even earlier
B. 2016
C. 2017
D. 2018
E. None of above

[YOU (AI assistant)]: 