Two developments have helped to transform Israel's economy since the beginning of the 1990s. The first is waves of Jewish immigration, predominantly from the countries of the former USSR, that has brought over one million new citizens to Israel. These new Soviet Jewish immigrants, many of them highly educated, had a wellspring of scientific and technical expertise to help spur Israel's burgeoning technology sector, now constitute some 15% of Israel's population. The second development benefiting the Israeli economy is the peace process begun at the Madrid conference of October 1991, which led to the signing of accords and later to a peace treaty between Israel and Jordan (1994).