The number of migrants who died crossing the Mediterranean Sea has topped 3,000 for the fourth year in a row.

A grim weekend of death pushed the 2017 toll to at least 3,033, the International Organization for Migration reported Tuesday.

At least 31 migrants died on Saturday after their boat capsized off the Libyan coast, the main departure point for African refugees. The coast guard rescued some 200 people, but many more remain unaccounted for. That same day, a 10-year-old Afghan boy was reportedly crushed to death on a boat carrying scores of people toward the Greek island of Lesbos. IOM reported an additional eight migrant deaths this weekend on the western Mediterranean route connecting North Africa to Spain.

Although the number of deaths so far this year is lower than 2016s year-end total of 5,143, the fatality rate has increased. As of Nov. 26, 163,979 migrants had attempted to cross the Mediterranean this year, and approximately 1.9 percent of them had died. A much greater number of migrants tried to cross in 2016, but the fatality rate for the year was 1.4 percent.

Even the 3,033 migrant deaths in the Mediterranean represent only a portion of the overall tragedy: IOM figures show there have been at least 5,124 migrant fatalities worldwide in 2017. Earlier this month, a German newspaper published a list of 33,000 migrants who have died en route to Europe since 1993.