The annual survey of employers by The Kaiser Family Foundation provides a detailed look at trends in employer-sponsored health coverage, including premiums, employee contributions, cost-sharing provisions, offer rates, wellness programs, and employer practices. The 2019 survey included 2,012 interviews with non-federal public and private firms.
The results of the survey can be obtained at http://files.kff.org/attachment/Report-Employer-Health-Benefits-Annual-Survey-2019.