Ummmm ... not to be a killjoy but ... 1998 - 2005 is actually eight years, not seven, if you're including all of both 1998 and 2005. Mid-1998 to mid-2005 though is seven years. Who knows what they meant (and who really cares) and everyone does this kind of thing ... I just think it's kind of funny when I see this kind of math. I'm easily amused.