I can get it down to 4% for you.<quoted text>
How do you know it's 2%?
What's 96 Percent of the Universe Made Of? Astronomers Don't Know
And I see you live in TN. So in a little comparison that would be like only knowing of 2 out of the 50 states in the United states. 4% of 50 = 2. So yes there is a whole lot of the universe we know nothing about.