per year

If implemented at the higher end, the tariffs now proposed by Trump would cost the average U.S. household over $2,600 per year, according to the Peterson Institute for International Economics.

The population of the white-backed vulture, for example, declined by around 90 percent in just three generations -- equivalent to an average decline of 4 percent per year.

More than 1 million people succumb to drug-resistant infections every year, and the death toll could reach nearly 2 million per year by 2050.

But other experts suggest this would amount only to a few thousand people per year - and attempt to seriously ramp up numbers may become politically toxic.

Royal Lodge, another residence in Windsor, occupied by the Duke of York, has its own security arrangements - said to cost several million pounds per year.