Unit rates and unit ratios. A unit rate is a ratio that has a denominator of 1. A unit rate is also called a unit ratio. (They mean the same thing.). $\frac{5}{4}$ and $3:8$ and $40\mbox{ to }10$ are ratios, but they are not unit ratios. $\frac{1.25}{1}$ and $0.375:1$ and $4\mbox{ to }1$ are unit ratios. unit rate is also called a unit ratio. (They mean the same thing.). $\frac{5}{4}$ and $3:8$ and $40\mbox{ to }10$ are ratios, but they are not unit ratios.
I found the following references to Coca-Cola Zero launching in the US in 2005: 1  Associated Press March 21, 2005 announcement that the product would launch in June - http://www.nbcnews.com/id/725792...  Case study by ATTIK, which provided worldwide branding services, citing a 2005 launch - ATTIK.
Coke just decided to rebrand Coke Zero as Coke Zero Sugar in the United States, and the effort has already been successful overseas, but the plan to rebrand with a new recipe and design hasn't been that well-received in the United States. The real problem is that Coca-Cola is fighting the decline in overall soda sales by reinventing at every turn. Diet Coke led to Coke Zero, which is now morphing into Coke Zero Sugar. On the one hand, that does help it offset the decline, but it also slows down the company's overall recovery on the beverages front.