Publications with International Co-Authors wdt_ID Academic Year Harvard U.S. 1 2000 23.7 18.0 2 2003 28.2 21.5 3 2006 29.7 22.8 4 2009 33.4 25.2 5 2012 38.2 27.5 6 2015 42.1 31.7 7 2018 46.0 35.4 Back