How much ginger is in Canada Dry ginger ale?

I wrote Canada Dry to ask, how much ginger is in Canada Dry ginger ale? Instead of getting a serious answer, I got a B.S. form letter. Here is Canada Dry's non-answer: "Our Company complies with all applicable labeling regulations promulgated in the United States by the Food and Drug Administration and other regulatory bodies. Product flavor components that form part of our 'natural' or 'natural and/or artificial flavors' ingredients are considered proprietary to our Company. If you have a concern regarding the intake of this product, we suggest that you contact your health care provider."