What is the earliest year where the result of the election was a retired republican hold?
{'header': ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates'], 'page_title': 'United States House of Representatives elections, 1996', 'section_title': 'Pennsylvania', 'caption': 'Pennsylvania', 'rows': [['Pennsylvania 1', 'Thomas Foglietta', 'Democratic', '1980', 'Re-elected', 'Thomas Foglietta (D) 87.50% James Cella (R) 12.49%'], ['Pennsylvania 2', 'Chaka Fattah', 'Democratic', '1994', 'Re-elected', 'Chaka Fattah (D) 87.99% Larry Murphy (R) 12.01%'], ['Pennsylvania 4', 'Ron Klink', 'Democratic', '1992', 'Re-elected', 'Ron Klink (D) 64.20% Paul Adametz (R) 35.76%'], ['Pennsylvania 5', 'Bill Clinger', 'Republican', '1978', 'Retired Republican hold', 'John E. Peterson (R) 60.26% Ruth Rudy (D) 39.70%'], ['Pennsylvania 9', 'Bud Shuster', 'Republican', '1972', 'Re-elected', 'Bud Shuster (R) 73.70% Monte Kemmler (D) 26.27%'], ['Pennsylvania 11', 'Paul Kanjorski', 'Democratic', '1984', 'Re-elected', 'Paul Kanjorski (D) 68.00% Stephen Urban (R) 31.99%'], ['Pennsylvania 12', 'John Murtha', 'Democratic', '1974', 'Re-elected', 'John Murtha (D) 69.99% Bill Choby (R) 30.00%'], ['Pennsylvania 17', 'George Gekas', 'Republican', '1982', 'Re-elected', 'George Gekas (R) 72.23% Paul Kettl (D) 27.76%'], ['Pennsylvania 20', 'Frank Mascara', 'Democratic', '1994', 'Re-elected', 'Frank Mascara (D) 53.89% Mike McCormick (R) 46.10%']]}