In the 2011 Polish census, 37,310,341 people reported Polish identity, 846,719 Silesian, 232,547 Kashubian and 147,814 German. Other identities were reported by 163,363 people (0.41%) and 521,470 people (1.35%) did not specify any nationality. Once prominent but now statistically insignificant minority groups include Polish Jews, Lipka Tatars, Armenians, Greeks, Lemkos, the Romani people and the Vietnamese. Ethnic Poles themselves can be divided into many diverse regional ethnographic sub-groups, most notable being the Kashubians, Silesians and Gorals (Highlanders). The statistics do not include recently arrived migrant workers. More than 1.7 million Ukrainian citizens worked legally in Poland in 2017.