Obama signed many landmark bills into law during his first two years in office. The economy of the United States has grown faster than the other original NATO members by a wider margin under President Obama than it has anytime since the end of World War II. The Organisation for Economic Co-operation and Development credits the much faster growth in the United States to the stimulus plan of the US and the austerity measures in the European Union. Obama called for Congress to pass legislation reforming health care in the United States, a key campaign promise and a top legislative goal. He proposed an expansion of health insurance coverage to cover the uninsured, to cap premium increases, and to allow people to retain their coverage when they leave or change jobs. His proposal was to spend $900 billion over 10 years and include a government insurance plan, also known as the public option, to compete with the corporate insurance sector as a main component to lowering costs and improving quality of health care.