I am trying to figure out Population percentage change based off census tract data from 2010 and 2014 data. One of my tables I pulled from the U.S. Census Bureau (2010 data); this table came with the shapefile that was downloaded from their website and is String as its type. I also have the census tract table data from American Fact Finder (2014 data); this table is a CSV file I imported into ArcMap. It is a Double as its type. I was going to add a field to my target table (2010 data) so I can join the 2014 data to it but I am not even allowed to add a field (it is grayed out).
My main objective is to add the 2014 data to the 2010 data table (using the Census tracts as a common link) so I can calculate the population percentage change based off each census tract over the course of those years. I am using ArcGIS 10.3.1.