need to add population numbers for college students that are excluded from the low income calculations so that people can replicate the math #2247

Describe the bug
In order to replicate the math that (total population - population enrolled in higher ed = population considered low income) the population enrolled in higher ed numbers should be included in the spreadsheet

To Reproduce
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1. Go to 'download file'
2. Scroll down to '....'
3. See error

Expected behavior
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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