Question: Pennsylvania Route 51 includes the West Mifflin mall that was opened in what year?

Context paragraphs:
West Mifflin Area High School: The "West Mifflin North High School" first opened its doors on Commonwealth Avenue in West Mifflin in 1960.  At that time, it was the only public High School in West Mifflin and did not have a senior class.  West Mifflin South High School opened on Camp Hollow Road in the following year, 1961, and became the second public High School in West Mifflin.  In 1962 there were two graduating classes in West Mifflin, the class of 1962 from West Mifflin North High School and the class of 1962 from West Mifflin South High School.

Century III Mall: Century III Mall is an ailing enclosed shopping mall located in the southern Pittsburgh suburb of West Mifflin, Pennsylvania.  It is the fourth largest shopping mall in the Greater Pittsburgh area.  Opened in 1979, and remodeled in 1997, the three-level mall contains 1290000 sqft of retail space and approximately 25 stores.  Anchor retailers at Century III Mall include Dick's Sporting Goods and J. C. Penney.  From 1996-2011, it was owned and operated by Simon Property Group, and prior to Simon, the Edward J. DeBartolo Corporation, who built the mall.  It is currently owned and operated by Las Vegas-based Moonbeam Capital Investments LLC.

Pennsylvania Route 201: Pennsylvania Route 201 (designated by the Pennsylvania Department of Transportation as State Route 201, abbreviated PA 201) is a 25 mi south-north state highway located in Southwestern Pennsylvania in the counties of Fayette and Westmoreland.  The southern terminus is at U.S. Route 119/PA 711 in Connellsville.  The highway heads northwest and meets up with Pennsylvania Route 51 twice at two separate locations and Interstate 70 in Rostraver Township.  The northern terminus is at Pennsylvania Route 136 in Rostraver Township.

Pennsylvania Route 51: Pennsylvania Route 51 (PA 51) is a major state highway in Western Pennsylvania.  It runs for 89 mi from Uniontown to the Ohio state line near Darlington, where it connects with Ohio State Route 14.  Route 51 is the termination point for Pennsylvania Route 43, Pennsylvania Route 48 and Pennsylvania Route 88.  Century III Mall is located on this road in West Mifflin.  The Route is a major connection from Uniontown and the rest of Fayette County to Pittsburgh.

Pennsylvania Route 981: Pennsylvania Route 981 (PA 981) is a state highway which runs 50.4 mi across Westmoreland County, in southwestern Pennsylvania.  The highway begins at Pennsylvania Route 51 in Rostraver Township, Pennsylvania, and runs northward across Westmoreland County, passing through the towns of Mount Pleasant, Latrobe, and New Alexandria before ending at Pennsylvania Route 819 in Salina.

Pennsylvania Route 837: Pennsylvania Route 837 (PA 837) is a state route located in western Pennsylvania.  The southern terminus of the route is at Pennsylvania Route 88 in the Carroll Township hamlet of Wickerham Manor.  The northern terminus is at U.S. Route 19 and Pennsylvania Route 51 in downtown Pittsburgh at the junction of the Ohio, Allegheny and Monongahela rivers.  The highway parallels the Monongahela River for all of its route with the exceptions of its extreme north and south ends.  Popular amusement park Kennywood is located along this route.

Pennsylvania Route 88: Pennsylvania Route 88 (PA 88) is a 68 mi north–south state highway located in southwestern Pennsylvania.  The southern terminus of the route is at U.S. Route 119 in Point Marion less than 2 mi from the Pennsylvania-West Virginia border.  The northern terminus is at Pennsylvania Route 51 in Pittsburgh.  PA 88 runs parallel to the Monongahela River for almost its entire length.

Pennsylvania Route 434: Pennsylvania Route 434 (designated by the Pennsylvania Department of Transportation as SR 0434) is a 12.47 mi state highway located in northeast Pennsylvania.  The western terminus of the route is at Pennsylvania Route 739 in the Blooming Grove Township community of Lords Valley.  The eastern terminus of the route is at the New York-Pennsylvania border in Shohola Township, where PA 434 crosses the Delaware River and enters New York, becoming New York State Route 55 at an intersection with New York State Route 97 in the town of Highland.  State Route 434 used to be part of Pennsylvania Route 37 and Pennsylvania Route 137.

West Mifflin Area School District: West Mifflin Area School District is a suburban, public school district in the Commonwealth of Pennsylvania.  It is located in the south hills of Allegheny County.  It serves the boroughs of West Mifflin, and Whitaker.  As of 2007, the district also serves some students from the neighboring City of Duquesne.  West Mifflin Area School District encompasses approximately 15 square miles.  According to 2000 federal census data, it serves a resident population of 22,802.  In 2009, the district residents' per capita income was $18,240, while the median family income was $45,660.  Per District officials, in school year 2005–06, the West Mifflin Area School District provided basic educational services to 3,273 pupils through the employment of 199 teachers, 111 full-time and part-time support personnel, and 18 administrators.  In 2009, the school districts served 3,149 students.

Pennsylvania Route 48: Pennsylvania Route 48 (PA 48) is an 18.9 mi state highway located in the Pittsburgh, Pennsylvania area.  The route is predominantly a two-lane highway as it runs through McKeesport and other suburbs.  The entire routing of PA 48 is part of the Orange Belt, both reaching their southern termini at Pennsylvania Route 51, southeast of Elizabeth.  Until 1998, the northern terminus of PA 48 was at the intersection of Old Haymaker and Center Roads, about 1/2 mile from its current terminus at U.S. Route 22 Business in Monroeville.

Supporting paragraphs: Pennsylvania Route 51 Century III Mall
Answer: 1979