The number of heroin seizures and the quantities seized at the border with Mexico have also risen sharply, from 846 kg seized in 295 incidents in 2009 to 2,196 kg seized in 580 incidents in 2013. The increased smuggling of Mexican and Colombian heroin into the United States through the Mexican border has led to a change in heroin trafficking patterns, as western states in the United States are becoming major transit areas for the drug. In Mexico, opium poppy eradication efforts have continued. According to UNODC, Mexico eradicated 14,662 hectares of opium poppy cultivation in 2013, a decrease of 7 per cent since 2012.