Based on the following description on the rules to calculate an Annual Fee, draw an Extended Entry Decision Table (EEDT) and write the related source codes that implement the calculateAnnualFee() method. You may use either Java, C#, C, or C++ to write the source codes.

XYZ Special Interest Group introduces a number of different membership fee discounts based on the membership level and number of past voluntary work of their members (or potential member). For entry level member (new member or the existing members with less than 5 years of membership), no discount is given. For senior members (who has been a member for at least 5 years), 30% discount is given for the annual membership fee. For the members who have registered for more than one year, XYZ gives a discount based on the number of voluntary work in the previous year. 10% discount is given for members with 1 to 3 voluntary work, 20% discount for 4 to 8 voluntary work, and 30% is given for members with more than 8 voluntary work.