Here you can see your jobs volumes categorized by work fields and presented as a chart. If, for example, you did one job counted in words and the other counted in hours, both these jobs will be included into this chart. To achieve correct volume representation in different units, there is an 'Adjustment factor' column in the 'Units' catalog. If, for example, you know that 1 hour corresponds to about 600 words, than go to the 'Units' catalog and set this value for the 'Hours' unit. And vice versa, if your base unit is an hour, than you can set 0.0017 as an adjustment factor for words. Such approach allows to fit volumes in different units into the one chart.
You can select a period above the chart, save it as image or print.