NEW YORK — The number of foreign children adopted by U.S. parents dropped more than 12 percent last year, accelerating a decline that’s now continued for 13 years, according to new State Department figures. Sharp drops in adoptions from China and Congo more than offset notable increases from many countries, including India, Colombia and Nigeria. The department’s report for the 2017 fiscal year, released Friday, shows 4,714 adoptions from abroad, down from 5,372 in 2016 and nearly 80 percent below the high of 22,884 in 2004.