The good news is that the teen-age birth rate has fallen almost 9 percent since 1991.
( ( The ( good news ) ) ( ( is ( that ( ( the ( teen-age ( birth rate ) ) ) ( has ( ( fallen ( almost ( 9 percent ) ) ) ( since 1991 ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ good) (NN news)) (VP (VBZ is) (SBAR (IN that) (S (NP (DT the) (JJ teen-age) (NN birth) (NN rate)) (VP (VBZ has) (VP (VBN fallen) (NP (RB almost) (CD 9) (NN percent)) (PP (IN since) (NP (CD 1991)))))))) (. .)))
Teen birth rates have remain constant for decades.
( ( Teen ( birth rates ) ) ( ( have ( remain ( constant ( for decades ) ) ) ) . ) )
(ROOT (S (NP (NNP Teen) (NN birth) (NNS rates)) (VP (VBP have) (VP (VBP remain) (ADJP (JJ constant) (PP (IN for) (NP (NNS decades)))))) (. .)))