For this chain-of-thought reasoning and answer, what was the question?
The relevant sentence in the passage is: Construction began in the late-1980s and was completed in 2001.
 A: began in the late - 1980s and was completed in 2001
Q: Arizona State Route 101, or Loop 101, (spoken as one-oh-one) is a semi-beltway encompassing much of the Phoenix Metropolitan Area in the United States. It connects several suburbs of Phoenix, including Tolleson, Glendale, Peoria, Scottsdale, Mesa, Tempe, and Chandler. Construction began in the late-1980s and was completed in 2001. Additional general purpose lanes and a high occupancy vehicle lane (HOV) are being constructed along the eastern stretch of Loop 101 from Scottsdale to Chandler, starting at Princess Drive to Loop 202 (the Santan Freeway).

Based on this passage, when was the 101 freeway built in az?