Dear friends, I am confused if marginal effects at means be likely greater than one?

Code:
sysuse auto, clear
probit foreign gear_ratio
margins, dydx(gear_ratio) 
margins, dydx(gear_ratio) atmeans //marginal effects at means
margins, dydx(gear_ratio) at(gear_ratio=3.3)  //marginal effects for respenstatives
Thank you a lot!