This is an interesting post from Ballot Access News. Here is an excerpt : 

More independent candidates for the legislature have been getting elected during the last decade, compared to previous years. In every even-numbered general election, more than ten independent candidates have been elected in 2022, 2020, 2018, 2016, and 2014. But there are no years in which more than ten independents got elected to state legislatures at any time 1975-2010.

The highest number of independent winners since World War II was in 2012, when 17 were elected.

The number of winners in other recent years has been: 2022, thirteen (at least); 2020, fifteen; 2018, thirteen; 2016, twelve; and 2014, fifteen.

Read the full article here.