Question Grouping rows in Table

Outlining or grouping contiguous rows works as shown using Data>>Group after highlighting rows. Question: Does grouping work on a Table? If so, how so that I can get a result similar to what shows in image on right below.
I find in a table, the =SUM[Pop in M] sets to 0 when rows are grouped.

I was able to...



using Excel 2013

Thanks, NBVC for your input. Ah! If only I had been a bit more observant... I used AutoSum on the Home ribbon when creating a sum of a column of a table. It defaults using SUBTOTAL function. SUBTOTAL function's first parameter is function_num, which when > 100, as in images 1 and 2 below (function_num is 109) ignore hidden row values. If I edit the value of function_num to 9 so that expression is: =SUBTOTAL(9,[Pop in M]), then hidden values are not ignored and the result in B5 is 70, left undisturbed when the group is collapsed/hidden.
SUBTOTAL nicely documented at: https://support.office.com/en-us/article/SUBTOTAL-function-7B027003-F060-4ADE-9040-E478765B9939