Map<String, String> createData(int siteNum) {
        Map<String, String> data = new HashMap<String, String>();
        for (int i = 2; i <= 20; i += 2) {
            data.put("x" + i, String.valueOf(i * 10));
        }
        if (siteNum % 2 == 0) {
            data.put("x" + (siteNum - 1), String.valueOf(10 * (siteNum - 1)));
            data.put("x" + (siteNum - 1 + 10),
                    String.valueOf(10 * (siteNum - 1 + 10)));
        }
        return data;
    }