The first Congress under Barack Obama–the 111th Congress of 2009-2010–was the most productive Congress since the 89th Congress of 1965-1966 under Lyndon B. Johnson.
Despite all of the attacks on Nancy Pelosi, she can be regarded as a great Speaker of the House from 2007-2010, and once a Democratic President was in office, that 111th Congress reached its peak.
Ever since 2011, when the Republicans took over the House of Representatives, and since 2015, when they took over the US Senate, nothing much has been accomplished, and the number of days per year that either or both houses have been in session, has rapidly declined.
John Boehner and Paul Ryan in the House of Representatives, and Mitch McConnell in the US Senate have performed in a horrible fashion, and have worked at obstructionism during the Obama years, and in a vicious, vengeful way this year under President Donald Trump.
Each Congress since the 111th has been worse than the one before, so the 112th Congress (2011-2012); the 113th Congress (2013-2014); the 114th Congress (2015-2016); and the present 115th Congress (2017-2018) will, as a group, go down as the most disgraceful period of years of Congress in the past hundred years!