1993a-115 2006c-355 2009h-223 20thcentury 21stcentury birthcontrol china economicaspects emigrationandimmigration familyplanningservices familysize fertility fertilization geneva governmentpolicy hb1049m214p1989 hb915g582003 history human immigrants india mortality numericaldata occupations papuanewguinea population populationcontrol populationdynamics populationgroups populationgrowth populationpolicy publicpolicy socialconditions socioeconomicfactors states statistics switzerland trends unitedstates wp565g563f2003