I do that by using reports in Manager with multiple comparison periods. Then drill down on any figures of concern.
For my purposes intervals of 3 months (BAS reporting interval) or yearly works well. For shorter time frames, reports with relative dates would be a useful addition. Datepicker Defaults - Feature Request - #2 by Patch
I’m not convinced a graph would be better as I would loose easy drill down to investigate changes. Copy to clipboard to export to a graphing program is already supported. I’m not convinced there is any one variable everyone would want graphed.