DEREK GATOPOULOSATHENS, Greece (AP) â¿¿ Greece's Parliament passed a crucial austerity bill early Thursday in vote so close that it left the coalition government reeling from dissent. The bill, which will further slash pensions and salaries, passed 153-128 in the 300-member Parliament. It came hours after rioters rampaged outside Parliament during an 80,000-strong anti-austerity demonstration, clashing with police who responded with tear gas, stun grenades and water cannons. Approval of the cuts and tax increases worth â¿¬13.5 billion ($17 billion) over two years was a big step for Greek efforts to secure the next installment of its international rescue loans and stave off imminent bankruptcy. The country's international creditors have demanded that the bill and the 2013 budget, due to be voted on Sunday, pass before they consider releasing an already delayed â¿¬31.5 billion installment from Greece's â¿¬240 billion bailout. Without it, Prime Minister Antonis Samaras says Greece will run out of money on Nov. 16. "Greece made a big decisive and optimistic step today. A step toward recovery," Samaras said, adding that he was "very happy" with the result. Development and growth for the country, which faces a sixth year of a deep recession in 2013, will come "only with a lot of work, with coordinated action, with investments," he said. But the close vote was a major political blow to the three-party coalition government, which holds a total of 176 seats in Parliament. The result shows support for continued austerity three years into Greece's financial crisis is dwindling fast. "The government now has very little margin to take measures like this again," said Dimitris Mardas, associate professor of economics at the University of Thessaloniki. "But unless it takes various obvious actions like limiting the black economy, addressing tax evasion and improving the country's investment framework, we may end up needing new measures. And then things will be very difficult."