the inclusion of members of Sahrawi tribes that escaped from Spanish invasion to the north of Morocco by the 19th century. Efforts by the UN special envoys to find a common ground for both parties did not succeed. By 1999 the UN had identified about 85,000 voters, with nearly half of them in the Moroccan-controlled parts of Western Sahara or Southern Morocco, and the others scattered between the Tindouf refugee camps, Mauritania and other places of exile. Polisario accepted this voter list, as it had done with the previous list presented by the UN (both of them originally based on the Spanish census of 1974), but Morocco refused and, as rejected voter candidates began a mass-appeals procedure, insisted that each application be scrutinized individually. This again brought the process to a halt. According to a NATO delegation, MINURSO election observers stated in 1999, as the deadlock continued, that "if the number of voters does not rise significantly the odds were slightly on the SADR side". By 2001, the process had effectively stalemated and the UN Secretary-General asked the parties for the first time to explore other, third-way solutions. Indeed, shortly after the Houston Agreement (1997), Morocco officially declared that it was "no longer necessary" to include an option of independence on the ballot, offering instead autonomy. Erik Jensen, who played an administrative role in MINURSO, wrote that neither side would agree to a voter registration in which they were destined to lose (see Western Sahara: Anatomy of a Stalemate). Baker Plan As personal envoy of the Secretary-General, James Baker visited all sides and produced the document known as the "Baker Plan". This was discussed by the United Nations Security Council in 2000, and envisioned an autonomous Western Sahara Authority (WSA), which would be followed after five years by the referendum. Every person present in the territory would be allowed to vote, regardless of birthplace and with no regard to the Spanish census. It was rejected by both sides, although it was initially derived from a Moroccan proposal. According to Baker's draft, tens of thousands of post-annexation immigrants from Morocco proper (viewed by Polisario as settlers but by Morocco as legitimate inhabitants of the area) would be granted the vote in the Sahrawi independence referendum, and the ballot would be split three ways by the inclusion of an unspecified "autonomy", further undermining the independence camp. Morocco was also allowed to keep