The expected life-span of Beijing residents has gone up by _______ compared with that a decade earlier.

　　The expected life-span of Beijing residents has gone up to 75.5 years old compared with 74.4 years old a decade earlier, while the death rate of middle-aged residents increased dramatically according to a recent official report. The report made public by the Beijing Disease Control and Prevention Center said that the past mortality of people aged between 35 to 54 years old had gone up 58.5% during the past ten years, from 158 people per 100,000 in 1991 to 251 people per 100,000 last year.
    Infant and maternal mortality rates went down 132% and 147% respectively. Health experts said chronic non-infectious diseases were the main cause of death, covering 60% of the total number of deaths. The male mortality rate is higher than that of the females and the death rate among rural residents is higher than that of urban ones.