Each week, how many days per week are added to the average lifetime of Africans and Europeans? How is this different to 50 years ago?

Difference between the increase in life expectancy in days per week, 1960-2000 and 2000-2016. For example, Libya's life expectancy increased on average by 4.9 days each week between 1960 and 2000. Between 2000 and 2016, it only increased by 0.6 days each week – 4 days less.