Replace "per 100,000 people" with a more general term

I want to title a graph. If it represented percentages, I could say something like "Percentage of people in full-time employment". If it contained fractions I could write "Fraction of people in full-time employment" etc, etc. But my graph shows the data in terms of the number of people per 100,000. The best I can come up with is "Number of people per 100,000 in full-time employment" but I'd like to include the "per 100,000" part under the graph and have a shorter title. Any suggestions on how best to do this? For example, could I write "Proportion of people in full-time employment"?

The term crude rate is used, but not exclusively for 100,000.

For instance,

A crude rate is the total number of cases or deaths divided by the total population and multiplied by 100,000 (for cancers by primary site) or by 1 million (for International Classification of Childhood Cancer [ICCC] groupings of childhood cancers).

CDC

Implied in the crude rate is that some standard scaling by a constant has been applied to push numbers to a human readable form.

This explanation shows typical values of the scaling constant, at least in the mind of the author.

A crude rate is defined as the total number of events, or count, divided by the mid-year total population of the selected geography and multiplied by a constant, which is a multiple of 10. Typical constants used for public health rates include 100, 1,000, 10,000, or 100,000.

MOPHIMS

By using crude rate in your title, you can push the scaling factor to elsewhere in the graph, such as the axis label. The title could be "crude rate of full-time employment", or simply (and in my experience much more commonly) "full-time employment rate", with the crude rate given on the appropriate axis.