Although the number of lives lost has fallen, refugees crossing the Mediterranean are dying at a quicker rate.

While fewer refugees have drowned in the Mediterranean so far in 2017 compared with the same period a year ago, the number of arrivals has fallen drastically - meaning that those who do set off from the Libyan coast have a greater chance of dying.

At least 2,550 refugees and migrants died in 2017 from January 1 to September 13, compared with 3,262 from January 1 to September 13, 2016, the IOM said – a drop of 22 percent.

However, arrivals to Europe have fallen much more sharply to 128,863 from 293,806 – a year-on-year decrease of 57 percent.

At this year's rate, one refugee would die for every 50 who land in Europe. Last year, one person would die for every 90 who safely reached Europe.

Read more: IOM - Refugees dying at quicker rate in Mediterranean

The Central Mediterranean journey, from Libya to Malta or Italy, is now the most active refugee route for refugees.

In March last year, two events slowed the flow of Europe-bound refugees migrating from Turkey and Greece. First, a string of countries effectively shut the Balkan route which allowed refugees to travel by land from Greece to western Europe. The EU-Turkey deal also came into effect, pushing hopeful asylum seekers in Greece back to Turkey and closing the Aegean route. Most of those affected were from the Middle East and Asia.

In the four years since October 2013, when deadly journeys started making headlines, the Mediterranean crossing has claimed the lives of 15,000 refugees and migrants, accounting for more than half of the 22,500 migrants who have died or gone missing globally.