Statewide, enterprise profits, taxes, leases, and natural resources support more than two-thirds of tribal government budgets. Though this statewide average masks some of the remaining economic dependence on the most remote reservations, the overall picture displays welcome and overdue self-sufficiency. –“The Economic and Fiscal Impacts of Indian Tribes in Washington,” 2012

What is the main idea of this passage?

Washington tribes are a long way from being self-sufficient.
Washington tribes receive half of all funding from outside sources.
Washington tribes mostly support themselves.
Washington tribes are entirely self-sufficient.