Not Compatible with my Partner? Is there any Insight in to 2015 for the horse and the rat?

I thought i would check to see how compatible me and my partner were....seems we are only 30% comapatible. He is a Rat (d.o.b: 8/6/1984) I am a Horse (d.o.b: 28/11/1990). I don't see how this is true, we both have learnt over the past 6 years each others boundaries and have learnt to communicate A LOT better and be more understanding of each others needs and beliefs. I agree that we do have totally different personalies but we have found a medium to even out the relationship and make it work. We love each other very much and we both have a very caring nature for each other.