A total of 6,400 infants and children from different parts of the world were adopted by U.S. citizens last year, according to the U.S. Department of State.

This was the lowest number in 33 years, and a 9 percent decrease from the year before, when 7,094 children were adopted from overseas.

Overseas adoption by American parents has declined steadily since 2004.

By country, the largest number came from China, at 2,040, followed by Ethiopia, Ukraine and Haiti.

South Korea came next with 370 children adopted to the U.S.