The DNA of one in 14 people in Britain is expected to be on a crime-fighting database by April 2008.
The Home Office has predicted there will be 4,250,000 DNA samples on the national DNA database at the end of 2007-08, or seven per cent of the population.
In March 2005 the figure stood at just over three million people, or five per cent of the population.
In comparison, the second-largest DNA database in Austria covers just one per cent of the population.
The UK Government and police have invested more than £300 million in the DNA Expansion Programme over five years. The law has also been changed so that samples can be kept from people who have been acquitted of any crime, or who have been arrested for a recordable offence but never charged.
Data released by Home Office minister Andy Burnham to the Commons' all-party Science and Technology Select Committee last November showed the number of crimes solved by DNA analysis had quadrupled in the last five years.
Direct detections more than doubled from 8,612 in 1999-2000 to 19,873 in 2004-05.
There were also a further 15,732 crimes detected as a result of further investigations linked to the original case in which DNA evidence was recovered.
Mr Burnham said that Government investment in DNA science meant there had been a 74 per cent rise in the number of crimes where potential DNA material was collected.