What percent of people on ECMO live?

Can you clarify the percentage of individuals who survive while on ECMO (Extracorporeal Membrane Oxygenation) therapy? I understand it's a critical care measure for patients with severe respiratory or cardiac failure, but I'm interested in knowing the survival rate associated with this treatment. Does it vary significantly depending on the patient's condition, age, or other factors? Additionally, have there been any recent advancements in ECMO technology or protocols that have improved survival rates?