Line chart showing that the total number of polls of individual races in midterms has steadily declined from almost 1,700 in 2010 to about 900 in 2022, while the number of generic ballot polls has grown from a little more than 100 in 2010 to almost 300 in 2022.
Based on polls whose final date in the field was between 180 and 15 days before the midterm election.