said in a release . `` It means that more coca bush was eradicated in Colombia than was grown in all of Bolivia and Peru . '' The value of coca leaf in Colombia is decreasing , making it less attractive for farmers -- 20,000 fewer households grew coca in 2008 than in 2007 , a decrease of 26 percent . The drug trade also is being disrupted , the report said . In Colombia , the U.N. said , authorities seized 200 tons of cocaine in 2008 , a 57 percent increase in seizures over 2007 , the report said . Peru reported an 86 percent increase in seizures of coca base and a 100 percent increase in the seizure of cocaine . Bolivia , likewise , reported a 45 percent uptick in seizures of coca base and a 145 percent increase in the seizure of cocaine . `` Cocaine supply is shrinking , as is demand in major markets of North America while cocaine use in Western Europe has stopped growing , '' Costa said . `` This may explain why prices are up , and purity is down . This may also explain why cartels are becoming
UNITED NATIONS -LRB- CNN -RRB- -- Coca cultivation and cocaine production have decreased in Colombia but increased in Bolivia and Peru , the United Nations reported . Workers help eradicate coca plantations in northwest Colombia in May . Colombian cultivation was down 18 percent , and production decreased 28 percent in 2008 , the U.N. Office on Drugs and Crime said in a report issued Friday . But cultivation increased 6 percent in Bolivia and 4.5 percent in Peru , the report said . Likewise , production went up 9 percent in Bolivia and 4.1 percent in Peru . `` The increases for Bolivia and Peru show a trend in the wrong direction , '' said Antonio Maria Costa , executive director of the U.N. drug office . Much of the decline in Colombia resulted from the manual eradication of 237 acres of coca , an increase of 44 percent over 2007 , and the spraying of another 328 acres with herbicide , the U.N. said . The production level is at a 10-year-low , the report said , and the cultivation amount is down to 2004 to 2006 levels . `` This is a remarkable achievement , '' Costa