Need expert advice on purchase of property in g-9, g-10 islamabad

Dear group members, aoa. I would like to know from property experts about the trend in the prices of properties in sector g-9 and g-10 islamabad. More specifically i want to know the average yearly price appreciation of 30ft x 50ft sized property in past 5-6 years. I need this information for purchasing a house in any of these sectors. Can someone guide, pl? Tia.