In 2013, a total of 42 people with ‘severe psychiatric problems’ were killed by lethal injection compared to 14 in 2012 and 13 in 2011.
The latest official figures also revealed a 15 per cent surge in the number of euthanasia deaths from 4,188 cases in 2012 to 4,829 cases last year.
The incremental rise is consistent with a 13 per cent increase in 2012, an 18 per cent rise in 2011, 19 per cent in 2010 and 13 per cent in 2009.
The rise is also likely to confirm the fears of Dutch regulator Theo Boer who told the Daily Mail that he expected to see euthanasia cases smash the 6,000 barrier in 2014.
Overall, deaths by euthanasia, which officially account for three per cent of all deaths in the Netherlands, have increased by 151 per cent in just seven years.