This rate of growth is primarily due to the Amish practice of having large families. It is not unusual to have over 10 children. Never Ask an Amish person to pose for a photograph. Amish buggies have the same right of way as automobiles. Pass them only when traffic allows and never use your horn.
Pedestrians are everywhere in Amish country.
Reduce your speed and allow plenty of room. Amish homes are private residences. Respect their privacy. Feel free to stop however, whenever signs advertise goods for sale.