Table:
text: Crime in Oregon
Crime statistics: 1960 - 2009
Crime statistics: 1960 - 2009
Year_ Population Index_ Violent Property Murder Forcible_rape Robbery Aggravated_assault Burglary Larceny_Theft Vehicle_Theft
1977 2376000 142256 10830 131426 117 948 2948 6817 38880 83306 9240
1978 2444000 148483 12278 136205 123 1008 3204 7943 39523 87033 9649
1979 2527000 161045 13781 147264 107 1121 3299 9254 40682 96823 9759
1980 2610477 174561 12802 161759 132 1084 3978 7608 45641 106712 9406
1981 2647000 186267 12671 173596 117 1105 4780 6669 52067 112518 9011
1982 2649000 173973 12529 161444 136 1057 4433 6903 47410 106061 7973
1983 2662000 166398 12986 153412 109 1078 4533 7266 46472 98880 8060
1984 2674000 166956 13533 153423 128 1201 4508 7696 48755 96742 7926
1985 2687000 180830 14807 166023 125 1363 4986 8333 50690 105725 9608

Question: What was the largest index of the 1084 violent rape of the year(s) in Oregon?