However, it was among the poorer classes that a decrease in the fertility rate has been more dramatic over the past decade - on the order of 20.5% (IBGE, Demographic Census 1960 to 2000).
不过，在过去的十年里，贫困阶层的生育率有了较大幅度的下降——下降了近20.5%（巴西地理统计局，1960至2000年人口普查）。