Time serie missing in output table

Hello, 
When i create a table in WEST 2014 (by dragging elements from the block details pane to the table), the column of time remains empty. Why ? 
Thank you for the help. 

Ahlem

You are right - the values of time are not outputted to the table and, as a consequence, the average and standard deviation of the other series cannot be computed.
It's an unfortunate incident that is going to be solved in SP2 - mid Sept 2014.