The PSA said 80 percent of the country 's 180,000 civil servants took part in the strike which is a rare challenge to President Robert Mugabe , who has been in power since independence from Britain in 1980 .
<response> The <organization>PSA</organization> said 80 percent of the country 's 180,000 civil servants took part in the strike which is a rare challenge to President <person>Robert Mugabe</person> , who has been in power since independence from <location>Britain</location> in 1980 . </response>