(S (S (NP (BASENP (QP (RB Over) (NN sixty)) (NNS ships)) (COMMA ,) (PP (IN in) (BASENP (NN total)))) (VP (VBP have) (VP (VBN been) (VP (VP (VBN hijacked) (PP (IN by) (BASENP (NNS pirates)))) (PP (IN since) (NP (BASENP (DT the) (NN start)) (PP (IN of) (BASENP (JJ last) (NN year))))))))) (PERIOD .))