House Retirements 2020

In every election cycle a certain number of representatives retire or run for other offices leaving behind open seats for their parties to defend. Here are the number of retirements in recent years:

Year Democrats Republicans
2018 18 34
2016 8 20
2014 16 25
2012 23 20
2010 17 20
2008 6 27
2006 9 18

This cycle, 0 Democrats, 0 Republicans and 1 Libertarian are retiring at the end of their current term.
Here are the announced retirements, sorted on PVI (Cook Partisan Voting Index).
Any seat between R+5 and D+5 is a swing district that has to be fought over, even more so if occupied by the "wrong" party.