Academic publications in the form of peer-reviewed journal articles and conference proceedings are an important medium where scientific discoveries are made and shared. This report presents data that reflect the expanding volume of research activity, variations in scientific impact, and a growing research ecosystem of international and domestic collaborations. Publication output grew 5% over the past 4 years, led by China and other middle-income countries. Also, over the last 4 years, publications classified as open access increased by over 8%, while articles in closed-access journals rose by almost 4%.