如何降低Switch案例陈述的循环复杂性

有一个带有开关盒的功能，我们需要减少它的CC

There is an function which has switch case and we need to reduce its CC

       string data = string.empty;
       switch (value)
        {
            case "Less than 2 billion":
                data = "0 - 2B";
                break;
            case "2 billion to 10 billion":
                data = "2B - 10B";
                break;
            case "10 billion to 20 billion":
                data = "10B - 20B";
                break;
            case "20 billion to 50 billion":
                data = "20B - 50B";
                break;
            case "Greater than 50 billion":
                data = "> 50B";
                break;
            case "N/A":
                data = "N/A";
                break;
            case "[items] > 0":
                data = string.Empty;
                break;
        }
        return data;