English to Japanese Marketing Marketing

Hi

This term appears in a PPT presentation regarding the market structure of some consumer product.

Quote
----------------------------------------------------------------
- 60% are Caucasian
- Over indexed on Hispanics on a national basis
----------------------------------------------------------------

According to the chart, Hispanics are the second largest group making up about 25% of its owners.

I came up with a term 偏重, but this sounds a bit negative.
Does anybody have any idea to describe "over indexed" simply and precisely in japanese?
Is this a marketing jargon?

Thanks for your help in advance.