A voluntary question on national self-identification was also answered by 68.4 percent of the population. On this question, 83.8 percent declared Czech nationality, while 5 percent claimed to be Moravian, and 0.2 percent Silesian, totaling 89 percent. Among foreign nationalities, people most often identified as Slovak, at 1.3 percent, Ukrainian, at 1.1 percent, and Vietnamese, at 0.4 percent. Some 18,000 people declared Czech and European nationality at the same time.