The UN says that of all the food products Ukraine has exported under the grain deal over the past year:

• 47% have gone to "high-income countries" including Spain, Italy and the Netherlands
• 26% have gone to "upper-middle income countries" such as Turkey and China
• 27% have gone to "low and lower-middle income countries" such as Egypt, Kenya and Sudan

via https://www.bbc.com/news/world-61759692

64% of the wheat exported through the Black Sea Grain Initiative reached developing countries. Maize has been exported almost equally to developed and developing countries.

and

The United Nations World Food Programme (WFP – the largest humanitarian organisation in the world) has also shipped wheat from Black Sea ports. Before the war, the programme bought half of its grain stock from Ukraine. Since the start of the initiative in August 2022 over 725 000 tonnes of wheat have left Ukrainian ports to Ethiopia, Yemen, Afghanistan, Sudan, Somalia, Kenya and Djibouti.

Which is sadly not that helpful because it’s not in relation to other numbers. Source