After three years of steady decline, migration into the Czech Republic picked up in 2012, as the total number of immigrants reached more than 30 000 persons, an annual increase of about 34%. Emigrants numbered close to 20 000 persons, approximately at the same level as in 2011. The resulting net migration of 10 000 persons was about 40% lower than in 2011. The difference in net migration between 2012 and 2011 can be partially attributed to change in the monitoring system: migration statistics were transferred in mid-2013 from the population register to a specific information system on foreigners. The main nationalities among immigrants were Ukrainian, Slovak and Russian. Nationals of Viet Nam, Germany and the United States also represented a sizeable group and growing numbers among immigrants. Net migration accounted for almost all (96%) of the population increase in the Czech Republic in 2012. Figures for 2013 indicate that immigration remained at the same level, while emigration increased to about 30 000, yielding negative net migration. There was negative net migration of Ukrainians (about -7 000) and of Czechs (-2 000).