The State of Israel was declared in 1948, after Britain withdrew from its mandate of Palestine, the UN proposed partitioning the area into Arab and Jewish states, and Arab armies that rejected the UN plan were defeated. Israel was admitted as a member of the UN in 1949 and saw rapid population growth, primarily due to migration from Europe and the Middle East, over the following years. Israel fought wars against its Arab neighbors in 1967 and 1973, followed by peace treaties with Egypt in 1979 and Jordan in 1994. Israel and Palestinian officials signed a number of interim agreements in the 1990s that created an interim period of Palestinian self-rule in the West Bank and Gaza Strip, which Israel occupied in 1967. The most recent effort to negotiate final status issues took place in 2013-2014. Immigration to Israel continues, with 28,600 new immigrants, mostly Jewish, in 2016. The Israeli economy has undergone a dramatic transformation in the last 25 years, led by cutting-edge, high-tech sectors. Offshore gas discoveries in the Mediterranean, most notably in the Tamar and Leviathan gas fields, place Israel at the center of a potential regional natural gas market. However, longer-term structural issues such as low labor force participation among minority populations, low workforce productivity, high costs for housing and consumer staples, and a lack of competition, remain a concern for many Israelis and an important consideration for Israeli politicians. Prime Minister Benjamin NETANYAHU has led the Israeli Government since 2009; he formed the current center-right coalition following the 2015 elections, but must hold legislative elections no later than November 2019.