What year is WRX most reliable?

Could you please elaborate on which year of the WRX model is considered to be the most reliable? Are there any specific features or improvements made in that particular year that contribute to its reliability? It would be great if you could provide some insights or data to support your answer, such as customer reviews, reliability ratings, or technical specifications. Additionally, it would be helpful to know if there are any common issues or recalls associated with other years of the WRX that potential buyers should be aware of.