1) The programme was being watched by 5 million viewers at the beginning of January, but the figure had halved by June. It then rose gradually, ending the year at 3.5 million. 2) The number of visitors to the zoo fluctuated, but the general trend was upwards until the end of September. Visitor numbers then rose sharply, ending the year at half their September peak. 3) House prices had been level since 1960, but plunged in the early seventies. From the mid-seventies they picked up gradually; then suddenly soared in the mid-eighties. They remained steady for a decade, then dipped slightly before rocketing again in the late nineties. 4) Defence spending had been in steady decline throughout the sixties and seventies, but took off in the early eighties, nearly doubling in the space of five years. From then onwards it continued to grow, but at a slower pace, until the late nineties. The trend then reversed, and the figure started to fall gradually.

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