The country's main oil workers' union, Organisation nationale des employés du pétrole (ONEP), which represents around 4,000-5,000 workers, went on strike from March 31st to April 4th in furtherance of its demands that the government limit the number of foreign workers in the sector and increase the provision of training for locals. This is a long-running grievance, which was behind an earlier brief strike in April 2010 (May 2010, Economic policy). To avert further industrial action, in October the government acquiesced to the union's demands, promising to limit the number of foreigners working in the sector to a maximum of 10% and to ensure that all executive level positions be filled by local staff (October 2010, Economic policy). However, as expected, the government has since failed to honour its word, for two main reasons. First, sweeping nationalisation of personnel in this economically crucial sector, which is dominated by foreign companies, would greatly harm the company's image among international investors as an appealing place to do business. Second, there are not enough skilled Gabonese workers to fill the 90% of operational posts that unions would like reserved for locals, let alone all of the executive posts. In recognition of this, in March 2010 the government announced the creation of an institute specialising in education relevant to the hydrocarbons sector, Institut supérieur de formation aux métiers du pétrole et du gaz, in the economic capital, Port-Gentil (March 2010, Economic policy).