Also included were Vietnam, Mongolia, North Korea, Angola, Mozambique and Cuba when the former East Germany existed until reunification in 1990. The (socialist) German Democratic Republic (East Germany) however had their guest-workers stay in single-sex dormitories. Female guest workers had to sign contracts saying that they were not allowed to fall pregnant during their stay. If they fell pregnant nevertheless they faced forced abortion or deportation. This is one of the reasons why the vast majority of ethnic minorities today lives in western Germany and also one of the reasons why minorities such as the Vietnamese have the most unusual population pyramid, with nearly all second-generation Vietnamese Germans born after 1989.