How did the global average life expectancy at birth change between 1968 and 1998?

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Increased from 56 years to 67 yearsDecreased from 50 years to 47 yearsIncreased from 50 years to 61 yearsDropped from 54 years to 50 years

Explanation

Between 1968 and 1998, the worldwide life expectancy at birth rose from 50 years to 61 years, reflecting improvements in health and living conditions globally.