The table below shows the partisan history of the California Assembly following every general election from 1992 to 2016.
All data from 2006 or earlier comes from Michael Dubin's Party Affiliations in the State Legislatures (Mc Farland Press, 2007). Republicans controlled the Assembly from 1942 to 1956.
Legislative authority and responsibilities of the California State Assembly include passing bills on public policy matters, setting levels for state spending, raising and lowering taxes, and voting to uphold or override gubernatorial vetoes.
From 1992 to 2016, the California Assembly stayed reliably blue, with Democrats ceding the majority just once as a consequence of the 1994 Republican wave.
The heavy Democratic tilt in those years was in line with the chamber's history going back to the 1960s, where Democrats first established their dominant majority that mostly stayed intact afterwards.
Democrats briefly lost their two-thirds majority in 2014 when another Republican wave brought them down to 52 seats.
They won it back though in 2016 by gaining a 55-25 edge over Republicans.