What percent of German citizens claim to be bilingual ?
In the early 20th century the amount of Polish and bilingual citizens of Opole , according to the official German statistics , varied from 25 to 31%.¹ First census of the city² 8,320 German nationality ( 93 , 7 %) and 557 Polish nationality ( 6 , 3 %) ³ 80 % German - speaking , 16 % Polish - or Slavic Silesian - speaking , and 4 % German - and Polish - speaking