ReleaseHistory

Release	Date	javadoc	API changes
r01%	2009-09-15	javadoc
r02	2010-01-04	javadoc
r03	2010-04-09	javadoc
r04	2010-04-27	javadoc	API changes
r05	2010-05-28	javadoc	API changes
r06	2010-07-07	javadoc	API changes
[[7.0	Release07]]	2010-09-22	javadoc
[[8.0	Release08]]	2011-01-27	javadoc
[[9.0	Release09]]	2011-04-07	javadoc
[[10.0	Release10]]	2011-09-28, 2011-10-10	javadoc
[[11.0	Release11]]	2011-12-18, 2012-01-09, 2012-02-22	javadoc
[[12.0	Release12]]	2012-04-30, 2012-07-10	javadoc
[[13.0	Release13]]	2012-08-03, 2012-08-28	javadoc
[[14.0	Release14]]	2013-02-25, 2013-03-15	javadoc
[[15.0	Release15]]	2013-09-06	javadoc
[[16.0	Release16]]	2014-01-17, 2014-02-03	javadoc
[[17.0	Release17]]	2014-04-22	javadoc
[[18.0	Release18]]	2014-08-25	javadoc
[[19.0	Release19]]	2015-12-09	javadoc
[[20.0	Release20]]	2016-10-28	javadoc
[[21.0	Release21]]	2016-12-19 (rc1)	javadoc

% did not include Google Collections, which existed separately at that time

Note: Releases 1.0 through 11.0 require JDK 1.5 or newer. Releases 12.0 through 20.0 require JDK 1.6 or newer. Release 21.0 is expected to require JDK 1.8 or newer.