In his more recent study, Vronsky states that the term "serial killing" first entered into broader American popular usage when published in "The New York Times" in the spring of 1981, to describe Atlanta serial killer Wayne Williams. Subsequently, throughout the 1980s, the term was used again in the pages of "The New York Times", one of the major national news publication of the United States, on 233 occasions. By the end of the 1990s, the use of the term had increased to 2,514 instances in the paper.