For ohio redcross:
Out of 100 donors . . . . .
84 donors are RH+
16 donors are RH-
38 are O+
7 are O-
34 are A+
6 are A-
9 are B+
2 are B-
3 are AB+
1 is AB-
These CAN vary by area and race, but I wanted to give some guidelines.
As for the high incidence of -? That IS unusual, but RH - IS unusual and could have interesting problems. Maybe you guys/gals are just more likely to KNOW that! I figured my blood was o-! I just ASSUMED! Because I was SO altruistic! WHY???? Because O- blood can be given to ANYONE, but YOU can only use O-! BUT, when I had my heart operation, they decided to dope my blood with AB+, an I found out! You have to be AB+ to accept AB+ blood.
I KNEW that the cards were stacked against me in a way. Little did I know there were just some cards that fell on the floor. 8-(
BTW ONE potential problem with people that have RH- blood is leakage in the two sides of the heart. MOST people that have this find out early(It shows up when they are born), so don't worry. ANYWAY, at its most extreme, the blood gets mixed, and whites may show a blue tinge to the skin(hence the term "blue bloods")! Blue Blood is another term for royalty or high class people. Since they intermarried a lot, etc... Some genes thrived. Even recessive ones.
ALSO, this gives rise to ANOTHER theory! Limited blood lines, and Related chromosomes. You may all actually have some genes in common that RH + are unlikely to have. I could tell you some theories as to certain things, but since I never checked it out... Let's just say that you might b even a bit MORE unusual. Not in a bad way, just different.
Steve