OECD has published a study on the funding of developmental aid in 2017, shedding light on a troubling trend – the money provided for solving global problems is lessening and much of it is being used within Europe.
OECD report:
http://www.terveilm.ee/leht/wp-content/uploads/2018/05/ODA-2017-detailed-summary.pdf
Further studies:
https://concordeurope.org/2018/04/09/reaction-oecd-dac-2017-aid-statistics/