Recent polls indicate that only 15% of those registered to vote in an upcoming election is in the age group 18 to 25. A voter registration drive wants to raise this figure to 20% before the day of the election, so it begins to target this demographic exclusively. If there are currently 51,000 registered voters in the district, and assuming all new registrations are in the target demographic, approximately how many new voters does the drive need to register to meet its goal? ​