Most of the original wild vegetation is highly exploitable temperate forest, but much of this forest cover has disappeared. Since the latter half of the 20th century more than 10,000 hectares of forests have disappeared, with another 10,000 decimated from their former high density. The Nevado de Toluca National Park was established in 1936 with the purpose of preserving a 51,000-hectare area around the Nevado de Toluca volcano, also known as Xinantécatl. The Nevado de Toluca park, despite its status as a federal reserve has lost half its trees since its establishment, mostly due to illegal logging. Over 75% of the surface has some degree of erosion damage.