How many districts had results related to incumbent Toby Roth?
{'header': ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates'], 'page_title': 'United States House of Representatives elections, 1996', 'section_title': 'Wisconsin', 'caption': 'Wisconsin', 'rows': [['Wisconsin 1', 'Mark Neumann', 'Republican', '1994', 'Re-elected', 'Mark Neumann (R) 51% Lydia Spottswood (D) 49%'], ['Wisconsin 3', 'Steve Gunderson', 'Republican', '1980', 'Retired Democratic gain', 'Ron Kind (D) 52% James Harsdorf (R) 48%'], ['Wisconsin 4', 'Jerry Kleczka', 'Democratic', '1984', 'Re-elected', 'Jerry Kleczka (D) 58% Thomas G. Reynolds (R) 42%'], ['Wisconsin 7', 'Dave Obey', 'Democratic', '1969', 'Re-elected', 'Dave Obey (D) 57% Scott West (R) 43%'], ['Wisconsin 8', 'Toby Roth', 'Republican', '1978', 'Retired Democratic gain', 'Jay W. Johnson (D) 52% David Prosser, Jr. (R) 48%']]}