Tens of thousands of teachers have taken to the streets yesterday in the Portuguese capital, Lisbon, as the government faces a wave of discontent over the cost of living crisis.<br />'' <br />'' The demonstration has been described as one of the biggest protests in Portugal in recent years. The employee union claimed that more than 100,000 people take part in the protest.<br />'' <br />'' According to media reports, it is the third time in less than a month that teachers and school workers have held mass demonstrations in the country. Portugal is one of Western Europe's poorest countries, with government data showing more than 50 per cent of workers earned less than 1,000 euros per month last year.<br />'' <br />'' The minimum wage is 760 euros per month.<br />'' <br />''On Thursday, country's biggest umbrella union, the CGTP, held several protests and strikes across the country against rising prices, urging the government to increase workers' pay.