Table:
text: List of Heisman Trophy winners
Winners
Winners
Year_ Winner School Position_ Points _of_Points_Possible
1963 Roger Staubach Category:Articles with hCards ^ Navy Quarterback 1860 55.21%
1964 John Huarte Category:Articles with hCards Notre Dame Quarterback 1026 30.98%
1965 Mike Garrett Category:Articles with hCards USC Halfback 926 26.61%
1966 Steve Spurrier Category:Articles with hCards Florida Quarterback 1679 48.25%
1967 Gary Beban Category:Articles with hCards UCLA Quarterback 1968 63.50%
1968 O.J. Simpson Category:Articles with hCards *^ USC Halfback 2853 80.64%
1969 Steve Owens Category:Articles with hCards Oklahoma Fullback 1488 40.92%
1970 Jim Plunkett Category:Articles with hCards * Stanford Quarterback 2229 58.78%
1971 Pat Sullivan Category:Articles with hCards Auburn Quarterback 1597 42.25%
1972 Johnny Rodgers Category:Articles with hCards Nebraska Wide Receiver 1310 38.75%

text: List of Heisman Trophy winners
Winners
Winners
Year_ Winner School Position_ Points _of_Points_Possible
1944 Les Horvath Category:Articles with hCards Ohio State Quarterback / Halfback 412 18.31%
1945 Doc Blanchard Category:Articles with hCards Army Fullback 860 33.81%
1946 Glenn Davis Category:Articles with hCards Army Halfback 792 79.20%
1947 Johnny Lujack Category:Articles with hCards Notre Dame Quarterback 742 74.20%
1948 Doak Walker Category:Articles with hCards ^ SMU Halfback 778 28.56%
1949 Leon Hart Category:Articles with hCards * Notre Dame End 995 36.53%
1950 Vic Janowicz Category:Articles with hCards Ohio State Halfback / Punter 633 22.03%
1951 Dick Kazmaier Category:Articles with hCards Princeton Halfback 1777 60.01%
1952 Billy Vessels Category:Articles with hCards Oklahoma Halfback 525 14.32%
1953 Johnny Lattner Category:Articles with hCards Notre Dame Halfback 1850 49.14%

text: List of Heisman Trophy winners
Winners
Winners
Year_ Winner School Position_ Points _of_Points_Possible
1935 Jay Berwanger Category:Articles with hCards * Chicago Halfback 84 43.08%
1936 Larry Kelley Category:Articles with hCards Yale End 219 36.41%
1937 Clint Frank Category:Articles with hCards Yale Halfback 524 32.89%
1938 Davey O`Brien Category:Articles with hCards TCU Quarterback 519 29.62%
1939 Nile Kinnick Category:Articles with hCards Iowa Quarterback 651 31.00%
1940 Tom Harmon Category:Articles with hCards * Michigan Halfback 1303 54.29%
1941 Bruce Smith Category:Articles with hCards Minnesota Halfback 554 49.99%
1942 Frank Sinkwich Category:Articles with hCards * Georgia Halfback 1059 99.69%
1943 Angelo Bertelli Category:Articles with hCards * Notre Dame Quarterback 648 64.80%

text: List of Heisman Trophy winners
Winners
Winners
Year_ Winner School Position_ Points _of_Points_Possible
1954 Alan Ameche Category:Articles with hCards Wisconsin Fullback 1068 27.01%
1955 Howard Cassady Category:Articles with hCards Ohio State Halfback 2219 55.87%
1956 Paul Hornung Category:Articles with hCards *^ Notre Dame Quarterback 1066 26.96%
1957 John David Crow Category:Articles with hCards Texas A&M Halfback 1183 31.12%
1958 Pete Dawkins Category:Articles with hCards Army Halfback 1394 39.01%
1959 Billy Cannon Category:Articles with hCards * LSU Halfback 1929 53.72%
1960 Joe Bellino Category:Articles with hCards Navy Halfback 1793 52.89%
1961 Ernie Davis Category:Articles with hCards * Syracuse Halfback / Linebacker / Fullback 824 25.18%
1962 Terry Baker Category:Articles with hCards * Oregon State Quarterback 707 21.25%

Question: What is the full year of Heisman Trophy winners playing the halfback position with a % of possible points of 80.64%?