The majority of executions in Singapore are for drug offences. Since 2010, 23 prisoners have been executed for drug offences, while only 5 have been executed for other offences, such as murder. Death penalty supporters, such as the blogger Benjamin Chang, claim that Singapore has one of the lowest prevalence of drug abuse worldwide: he claims, for instance, that over two decades, the number of drug abusers arrested each year has declined by two-thirds, from over 6,000 in the early 1990s to about 2,000 in 2011. The validity of these figures is disputed by other Singaporeans, such as the Singaporean drugs counsellor Tony Tan. The United Nations Office on Drugs and Crime notes that Singapore remains a transit destination for drug traffickers in Asia, drug seizures continue to increase and heroin drug use within Singapore is continuing to rise.