Which of these is used to control human population?

To control the human population many birth control methods can be used, such as hormonal method, i.e., use of contraceptive pills (estrogen and progesterone are main constituents), mechanical prevention method, i.e., use of IUCDs (Intrauterine Contraceptive Device), surgical sterilization methods,like tubectomy (surgical removal of fallopian tubules) or vasectomy (surgical removal of vas deferens).