61.   The main factor influencing response rate is whether the survey is postal or personal.

62.   The Marginal rate of income tax is the percentage taken by the government of the last pound that an individual earns.

63.   The mathematical principles of determining where the rate of change is maximal are, for mathematicians, very straight forward.

64.   The mutation rate is bound to place an upper limit on the rate at which evolution can proceed.

65.   The new rates of pay are open to negotiation.

66.   The program is broadcast in the morning, a time when advertising rates are much lower.

67.   The propellant flow rates were controllable either manually or via the on-board computer system.

68.   The rate of departure was probably even more brutal among those at home with a remote control in their hands.

69.   The rates are cheaper than those of full-service brokers.

70.   The rates are highest in the industrialized world, for reasons that we can only speculate about.