The World Bank Blog post Chart: Two decades of progress in the world’s poorest countries by Donna Barne (12/11/2019) provides the chart copied here.
The last two decades have seen significant progress in many of the world’s poorest countries. The extreme poverty rate fell from more than 50% to about 30%. Child mortality declined from nearly 14% to 7%. Access to electricity increased by 57% and the share of people using at least basic drinking water and sanitation services increased by 22% and 41%, respectively, among other results.
Below the chart in the post is is a link to the World Bank IDA RMS Database where you can get the data for the chart and more (individual county data or different variables). Note for the chart for this data select IDA total for country.