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Project Haplogroup percentages as of November 8, 2014:
(N=145)

R1a=21%
R1b1=19%
I2a=17%
I1=9%
E1b=8%
J2=8%
G2=7%
Q=5%
N=2%
I2b=2%
T=2%
J1=1%
L= Less than 1%
C= Less than1%

Autosomal data averages for ethnic Szekler/Székely (as of January 30, 2015):

Eastern European = 44,1% (prevalence rate: 25/25)
Southern European = 17,8% (21/25)
Western&Central European = 12,9% (14/25)
Asia Minor = 8,4% (22/25)
Scandinavian = 5,2% (9/25)
British Isles = 3,5% (7/25)
Finland&North Siberia = 2,2% (12/25)
Eastern Middle East = 1,9% (6/25)
Northeast Asia = 1,5% (15/25)
Jewish diaspora = 1,3% (4/25)
Central Asia = 0,8% (8/25)
North Africa = 0,4% (5/25)

Please note that cases with low prevalence rates likely indicate external (non-Szekely) admixture like Jewish diaspora, Scandinavian and British Isles. 
In contrast, Asia Minor and Northeast Asian seem to be very ancient among Szekely being present among most samples at relatively low rate.