Not sure the data is accurate:

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There are three main types of ginseng on the market today. These include Wisconsin, Korean, and Siberian. Siberian ginseng is actually not a member of the ginseng family and does not contain any ginsenocides. Korean ginseng can be and has been measured for its active ingredient levels. Tests showed that on average, the total ginsenocide content of Korean ginseng was about 4%. Tests measuring the ginsenocide content of Wisconsin ginseng have shown average levels of 8%, double that of Korean ginseng. The secret to such high natural ginsenocide levels lies in the mineral rich virgin Wisconsin soils and in the perfect climate to produce ideal growing conditions.