How has immigration changed since the 1960s?
Immigration was high in the 1960s, and has gradually decreased.
Immigration was low in the 1960s, increased until 2000, and then decreased.
Immigration was high in the 1960s, decreased until 2000, and then increased.
Immigration was low in the 1960s, and has gradually increased.
Immigration was high in the 1960s, and has gradually decreased.
Immigration was low in the 1960s, increased until 2000, and then decreased.
Immigration was high in the 1960s, decreased until 2000, and then increased.
Immigration was low in the 1960s, and has gradually increased.