According to the census of 2001 , the city had a population of 101,069 inhabitants , and the municipality had a population of 148,443 inhabitants in a 319.4 kmÂ land area . According 2001 Census , provided by the Portuguese Instituto Nacional de EstatÃ stica , the city proper had a population of 101,069 and the municipality had a population of 148,443 in a 319.4 kmÂ land area .