A user of this community (whom I do not name to respect the Politics SE policies) says in comments to another question:
I am one of the few here who support the Palestinian right to self-determination and return of their land.
I am interested therefore in statistical data on the western (and beyond) support for the Palestinian self-determination. Note that this is not the same as support for Palestinians vs. support for Israel. Indeed, many Israel supporters also support the Palestinian self-determination - e.g., in the context of the two-state solution, which is the internationally accepted formula for resolving the Arab-Israeli conflict (i.e., a Palestinian state alongside the Jewish state.) On the other hand, there are Palestinian supporters who do not support the Palestinian self-determination: e.g., in the context of one-state solution one may believe in a single Palestinian state "from the river to the sea", but more nuanced views usually speak of a bi-national state where Jews and Muslims enjoy equal rights, and there non-dominance of either group is guaranteed - this view denies the self-determination to both peoples.
Just to clarify: the two state solution is accepted by most western states, by the Arab states (although not in Oslo context), and certainly by the UN - where the original partition plan originated, and where the Palestinian authority has the observer status. Moreover, many western Parliaments voted for recognition of the Palestinian state (headed by the Palestinian Authority.)
The question is about the public support for a Palestinian state (not necessarily in the context of the TSS, and not as a part of a bi-national Palestinian-Arab-Jewish state.)