In the second quarter of this year, gross domestic product slipped 1.9 per cent, according to official figures released today.
Gross domestic product (GDP) had already been down 0.7 per cent in the first quarter, the government statistics agency IBGE said.
Brazil's economy has been in trouble for four years, ever since the end of a boom fueled by commodity exports, principally to China. Falling prices for oil and other commodities have punched huge holes in the budget.
A huge corruption investigation named Operation Car Wash has revealed a bribes and embezzlement scheme revolving around state oil giant Petrobras and involving politicians and senior executives. Rousseff's Workers' Party has also been dragged into the scandal.
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"The GDP points to what Brazil has been experiencing recently: a strong recession, a pretty turbulent political situation, with inflation rising, with rates rising," said Alex Agostini, chief economist at Austin Rating.
A quick recovery is not expected, with unemployment rising steadily and the national currency, the real, down about 25 percent this year against the US dollar.
Earlier this month, a central bank survey of economists for the first time indicated that the contraction will continue through 2016 at a shallower rate.
That survey also showed that inflation remains forecast at 9.32 per cent this year, but it raised the 2016 projection for price rises to 5.44 per cent from 5.43 per cent.
Moody's has cut Brazil's credit rating to near junk status, reflecting growing struggles with debt.
Agriculture, where Brazil is one of the world's main producers of commodities like soybeans, sugar and poultry, slipped 2.7 per cent.
Reflecting the country's slowdown, consumer spending fell 2.1 per cent, the second consecutive quarterly drop.