specify the period
I totally agree with Karl on the first part (if the successful period has already begun), his first suggestion sounds really good.
However, the second suggestion sounds somewhat weird, the reason probably being that although the plural of "Zeit" exists we don't actually "count" them. (The use of "Zeiten" is very narrow.)
For this set of circumstances I would therefore suggest you simply specify the period (year, quarter...), if the context gives you the information.