You are correct in stating that these numbers are not specified in the question, but considering the three answer choices that are provided, only one of them satisfies the objective.
In other words, regardless of the two time periods, the second answer choice is correct. You can actually identify the correct one by eliminating those which are clearly incorrect.
If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.
hth
Marcin