What kind of restrictions are there on input format? Will the table always be nicely spaced already? Will every data cell contain a number? Will there always be at least one row of data?

And how about the output format? Can we pad lines to the end with spaces? Should there be precisely no extra table width on the left but one character of extra table width on the right, as in your example?

• Everything is right-justified and well spaced. A human can easily distinguish the columns.
  
• Assume that there will always be a header (first line) and a sub-header (second line).
• You can safely assume that every value cell (third line and down) will be filled.
• There will always be rows of data, but consider only using the first few, since the actual data could be thousands of lines long.
• As for output, the table I made was just a quickly done table to show how it could look like. The main goal of this challenge is to show that you are able to map the header and subheader to the column data below. Therefore, the output needs to show that you are successful in doing so. A simple table will do, or even a CSV that can easily be imported to Excel.

Is the purpose of this precisely to make an ASCII table? Or is it simply to convert the data into a more standard tabular format? Because you mentioned that converting it to CSV that can be imported into Excel would suffice, but I would like to point out that the input data can be imported into Excel just fine as-is, in which case my solution would be to do nothing.