How would I create this style of graph in word?

Use an Area Chart

Just a small addendum to Doug's response...

In case you did not notice, Doug is suggesting using an Excel part in your Word document. Excel has far better tools for data handling and display than does Word.

Hello ,

I'm Mukesh and I will be happy to help you out with your question.

It seems like a Area chart as per your image. Data that's arranged in columns or rows on a worksheet can be plotted in an area chart. Area charts can be used to plot change over time and draw attention to the total value across a trend. By showing the sum of the plotted values, an area chart also shows the relationship of parts to a whole.

Available chart types in Office https://support.microsoft.com/en-us/office/available-chart-types-in-office-a6187218-807e-4103-9e0a-27cdb19afb90

I hope this information helps. If you have any questions please let me know and I will be glad to help you out.

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Best regards Mukesh

Although the article Mukesh referenced suggests that the same type of chart is available in Word and Outlook. It should be adequate for data as simple as the OP's example.