How much of the Sonoran desert in Arizona is left?

I am curious due to the huge development of the desert that is going on around Phoenix and such. Thanks.

Maybe 85% of it is left untouched.

About 62.3565565% or so.

"496,600 acres of cactus plains and rugged mountain ranges southwest of Phoenix became, in 2001, the Sonoran Desert National Monument, one of four new BLM-administered zones in Arizona. Unlike NPS national monuments, the Sonoran Desert has very few facilities and no central attraction; its purpose is mainly to protect the historic sites, native habitats, vegetation and wildlife rather than attract visitors. The designated area spans 25 miles of I-8, with about half to the south, comprising the Table Top Wilderness, Vekol Valley and part of the Sand Tank Mountains, and half to the north, centered on the North and South Maricopa Mountain Wilderness. So now almost all of the Arizona desert south of I-8 is protected or used in some way, either within Indian Reservations, the Luke Air Force Base, or preserves of the NPS and BLM. There is however plenty of empty Sonoran desert in the state that still has no special protection beyond existing wilderness areas, between I-8 and I-10, and between the Colorado Rover and US 95, land which is just as scenic as this new monument."