Britain has sent three ships, including HMS Bulwark, a 19,000-tonne assault ship, and three helicopters to the Mediterranean. In just one day in June, the Royal Navy assault ship rescued 1000 migrants off the coast of Libya. Germany has sent boats and France has committed a boat and plane for later in the year.
The decrease in fatalities has occurred despite more men, women and children attempting the crossing to Europe from Africa's northern coastline since the end of April.
Nearly 28,000 people attempted the crossing between January 1 and April 26, while more than 42,000 made the attempt between April 27 and June 29.
Gauri van Gulik, deputy director of Amnesty International Europe, said it was "obvious" that more resources for search and rescue operations has saved lives.
"Any scaling down of search-and-rescue operations would only lead to more deaths at sea," he said.
The boosting of resources for Frontex came just days after more than 700 people died when a smuggling boat capsized and sank off the Libyan coast. Many of the victims were locked in the hold at the time. Further migrant disasters took the total number of deaths to 1200 for that week. The search and rescue operation had been scaled down following the closure of Italy's Operation Mare Nostrum at the end of 2014.
Changing waves
Number of refugees and migrants who attempted the crossing of the central Mediterranean:
27,722 January 1 - April 26, 2015
42,297 April 27 - June 29, 2015
Number of refugees and migrants who died or disappeared while crossing the central Mediterranean:
1721 January 1 - April 26, 2015
99 April 27 - June 29, 2015