What (a) were the changes in annual allowable discharge quantities at Koeberg Power station since the operation of the station up to the latest specified date for which information is available, (b) studies have been done on beta activity regarding leafy vegetables, fruit, dairy products, molluscs and crustaceans in a 20 kilometre radius at Koeberg and (c) independent epidemiological studies have been done on any changes in incidences of (i) leukemia and (ii) other cancer-related illnesses in affected areas around Koeberg as compared to areas remote from Koeberg?