1990, 1996, 2002, 2010, 2012, 2016.
With a 0-0 in 1992 as well (Denmark).
Defeats to start in 1986, 1988, 2000, 2004 and 2014.
Since I can remember (1986) I think that means the only wins to start a tournament have been against Tunisia twice and Paraguay. Is that about right?