There are three types of national elections in Mexico which are:
Presidential: occurs every 6 years. The first election was held in 1857 and the last one was in 2018.
Chamber of Deputies: occurs every 3 years. The first election was held in 1824 and the last one was in 2021.
Senate: occurs every 6 years. The first election was held in 1964 and the last one was in 2018.