An entity has a database that it purchased five years

ago. At that date, the database had 15,000

customer addresses on it. Since the date of

purchase, 1,000 addresses have been taken from

the list and 2,000 addresses have been added to the

list. It is anticipated that in two years' time, a further

4,000 addresses will have been added to the list. In

determining the value-in-use of the customer lists,

how many addresses should be taken into account

at the current date?