--http://www.state.gov/www/global/narcotics_law/1996_narc_report/index.html
For the Netherlands-- "Demand Reduction. The Netherlands has extensive demand reduction programs and lowthreshold medical services for addicts, who are also offered drug rehabilitation programs. Authorities believe such programs reach about 7080 percent of the country's 25,000 harddrug users. [my note: in a total population of 15.1 million]
--http://www.state.gov/www/global/narcotics_law/1996_narc_report/index.html
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Using a population of 3 million for Singapore in 1996, that works out to an addiction rate of about 0.30%.
Using the State Dept. figures for the Netherlands, and a population of 15.1 million, the addiction rate was about 0.17%.
Also note that the Singapore figure only takes into account the addicts under treatment, whereas the figure for Holland is the estimate of the total number of addicts.
Also, the Netherlands is overrun with Muzzies who would just as soon cut off your head as look at you. Compare crime rates with the lenient European countries to a strict county like Singapore and the comparison is a bit more valid. Drug use feeds crime, though there is a need to differentiate between the basically victimless soft drugs like cannabis (for which decriminalization is perhaps a logical alternative) and hard drugs like heroin.