Debug data_year

[bkleeman]

There is a variable data_year that should be global and update on click for the 2012 and 2022 year buttons. You can currently see it update in the console, but it doesn't properly update API URL strings, which are defined in string interpolation patterns. String interpolation requires a function to return a string to update variables nested within. Now it is just a matter of getting the right function set up.