Israel has one of the highest ratios of defense spending to GDP of all developed countries, only topped by Oman and Saudi Arabia. In 1984, for example, the country spent 24% of its GDP on defense. By 2006, that figure had dropped to 7.3%. Israel is one of the world's largest arms exporters, and was ranked fourth in the world for weapons exports in 2007. The majority of Israel's arms exports are unreported for security reasons. Since 1967, the United States has been a particularly notable foreign contributor of military aid to Israel: the US is expected to provide the country with $3.15 billion per year from 2013 to 2018. Israel is consistently rated low in the Global Peace Index, ranking 148th out of 162 nations for peacefulness in 2015.