pgdg yum repos missing versions <10 ?

I'm having difficulty locating and pulling down the PostgreSQL 9.6
server package from the pgdg YUM repository.  Versions 10 and newer are
working for me. Am I doing something wrong?

-Jeremy

[root(at)ip-172-31-39-28 ~]# yum repository-packages pgdg12 list|grep
postgresql.*server || echo NOT FOUND
postgresql12-server.x86_64                    
12rc1-2PGDG.rhel6          pgdg12

[root(at)ip-172-31-39-28 ~]# yum repository-packages pgdg11 list|grep
postgresql.*server || echo NOT FOUND
postgresql11-server.x86_64                     
11.5-1PGDG.rhel6          pgdg11

[root(at)ip-172-31-39-28 ~]# yum repository-packages pgdg10 list|grep
postgresql.*server || echo NOT FOUND
postgresql10-server.x86_64                   
10.10-1PGDG.rhel6           pgdg10

[root(at)ip-172-31-39-28 ~]# yum repository-packages pgdg96 list|grep
postgresql.*server || echo NOT FOUND
NOT FOUND

[root(at)ip-172-31-39-28 ~]# yum repository-packages pgdg95 list|grep
postgresql.*server || echo NOT FOUND
NOT FOUND

[root(at)ip-172-31-39-28 ~]# yum repository-packages pgdg94 list|grep
postgresql.*server || echo NOT FOUND
NOT FOUND

--
Jeremy Schneider
Database Engineer
Amazon Web Services