what results is the best performance from either in years . 
(ROOT (S (NP (WDT what) (NNS results)) (VP (VBZ is) (NP (NP (DT the) (JJS best) (NN performance)) (PP (IN from) (NP (CC either))) (PP (IN in) (NP (NNS years))))) (. .)))
(ROOT (S (NP (WDT ) (NNS )) (VP (VBZ ) (NP (NP (DT ) (JJS ) (NN )) (PP (IN ) (NP (CC ))) (PP (IN ) (NP (NNS ))))) (. )))