"A slight decrease on"

[en_buff]

Hello, there

I read this article here: http://news.discovery.com/animals/e...175-rhinos-in-south-africa-in-2015-160121.htm

and was a little puzzled by this specific phrase "a slight decrease on 2014." The "on" in this phrase doesn't sound quite right to me. Shouldn't it be "from" or "in"?

Thanks for your help in advance,

 

[GoesStation]

On is sometimes used in place of with respect to in this kind of phrase. You'll often see it in phrases like a year-on-year decrease/increase in same-store sales.​ "Same-store sales" are sales in stores which existed in both periods being compared.

 

[Tdol]

From could work, but in would not as the sentence is talking about 2015 and not 2014.