To ask the Scottish Executive how many NHS patients have been de-registered from dental practices in each of the last five years, broken down into age groups: (a) 0 to 2, (b) 3 to 5, (c) 6 to 12, (d) 13 to 17, (e) 18 to 24, (f) 25 to 34, (g) 35 to 44, (h) 45 to 54, (i) 55 to 64, (j) 65 to 74 and (k) 75 and over.