What has happened to the boys triple jump?

It has been almost 30 years since anyone has triple jumped as far as the jumpers prior to 1982.
Only one jumper has broken 46 feet this Millennium and that was 18 years ago. 46-0¼ Maurice White, Rancho Cotate 2001.
Of the seven best jumpers ever three were from 1978 and two from 1981.

Rob McCorkel

48-7½ Rob McCorkel, Petaluma #1 1981
48-7 Marvin Colter, Piner #1 1978
47-9 Ray Marchbanks, Santa Rosa #1 1978
47-4¼ Jim Brown, Santa Rosa #2 1971
46-11½ Allen Kuhn, Cloverdale #1 1978
46-3 Tyree Gray, Montgomery #1 1973
46-3 Jeff Johnson, Petaluma #2 1981

History of the boys triple jump

I was only a 40 footer in 1978 and would always lose by 4-6 feet at meets.