I try to get a difference between Year 2020 & 2016 for all region except APAC & MENA. Therefore CIS = 239 - 223, Europe = 473 - 455, Latin America = 521 - 453, North America = 315 - 292, Sub-Saharan Africa = 543 - 427. Then I sum them up together and got 241. Still think I am not on the right track. I should maybe look at the difference between Year 2016 & 2012. But don't think it helps.