The most affected areas are concentrated in the Apurimac, Ene and Mantaro river valleys and in the province of La Convention and the Lares district of Calca province, which together contain 68 per cent of the country’s coca bush cultivation. The shrinking supply has affected the purity levels of the coca base and cocaine, which showed a slight decrease in prices from 2013 to 2014. In the Bolivarian Republic of Venezuela, authorities reported that cocaine seizures amounted to about 26 tons in 2014. Seizure totals have been relatively stable since 2010, when about 25 tons of cocaine were seized.