Hahahaah we are humans and we are capable of loving ourselves and our partner too. There is no percentage. The bottom line is, love yourself enough because only when you love yourself can you know how to love another.
For instance, you went out and saw a very nice hand bracelet for a guy. You decided to buy it for yourself. Meaning you love yourself enough to desire a good thing, so if you are in a relationship of any sort and that person means a lot to you, it is only normal to get an extra bracelet for your partner.