Suppose that the government has an outstanding debt of $96 billion at the end of 2015. Then, in year 2016 there is a deficit of $50 billion; in 2017 there is a deficit of $70 billion; in 2018 there is a surplus of $45 billion; and in year 2019 there is a deficit of $22 billion.

What is the government debt at the end of 2019? Assume all surpluses are applied toward reducing the debt and all deficits add to the debt.