You can present the trends of your data in table and it can be very elucidating, hence this representation can indeed replace the graph in your dissertation.
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Presenting results in tables can help you describe trends, but more indicative and clearer for users is graphical representation in different variants or schemes.
Graphical representation of values is a typical way to establish any trends, besides, having the values in a table might assist in finding out the trends. However, the tabular method may be cumbersome just in case you have too many variables in the domain, for this case, you may decide to work with certain intervals and compare their outputs in the entire values.