Some more information from Prouty's book, which might be of interest.
Longitudinal
The avg. 'aft' value of 11 helicopters is +13.45º.
The avg. 'forward' value of 11 helicopters is -8.04º.
The average longitudinal cyclic range of all 18 helicopters is 23.54º.
The greatest is 34º.
The Robinson R22 is -9.0 to +11.0 (20º)
Lateral
The avg. 'left or right' value of 11 helicopters is +/- 7.43º.
The average lateral cyclic range of all helicopters is 15.07º.
The greatest is 20º.
The Robinson R22 is -9.5 to +6.0 (15.5º)
Of the 18 helicopter listed; 6 have equal forward and aft cyclic, and 12 have greater aft cyclic than forward cyclic.