(S (S (PP (PP (IN From) (BASENP (NN 1971))) (PP (TO to) (BASENP (NN 2006)))) (COMMA ,) (S (NP (BASENP (RB approximately) (NN one) (NN half)) (PP (IN of) (BASENP (DT the) (NNP U.S.) (NN honey-bee) (NNS colonies)))) (VP (VBD vanished)))) (PERIOD .))