With how much % is expected to increase urbanization until 2050?

it depend on situation employment and other reason but my expectation is 70%

THIS DEPEND ON TECHNOLOGY, POPULATION, WARS AND IMMIGRATION.

Urbanization is expected to increase until 2050 by Sixty six percent 

According to the UN, "the proportion of the world’s population living in urban areas is expected to increase [by] 66 per cent [until] 2050" (World Urbanization Prospects: The 2014, page 6). 

lack of concentration on living conditions of backward areas... it is expected to increase 70 %..... I have seen still many students come from balochistan and other backward areas to study in my university....a girl was sharing her experience ,she had to work in university till late hours cox her village had no access to internet.