How many times have number one seeds win ncaa tournament?

1982 North Carolina, 1984 Georgetown, 1987 Indiana, 1990 U.N.L.V., 1992 Duke, 1993 North Carolina, 1994 Arkansas, 1995 U.C.L.A., 1996 Kentucky, 1999 Connecticut, 2000 Michigan State, 2001 Duke, 2002 Maryland, 2005 North Carolina, 2007 Florida, 2008 Kansas, 2009 North Carolina, 2010 Duke, 2012 Kentucky, 2013 Louisville, 2015 Duke, 2017 North Carolina, 2018 Villanova, 2019 Virginia