year,union_density_pct,source
1954,33.5,CRS Report R47596 - post-WWII peak
1960,30.4,CRS Report R47596
1970,27.0,CRS Report R47596
1980,22.2,CRS Report R47596
1983,20.1,BLS - first year of consistent CPS tracking
1990,15.5,BLS
2000,13.5,BLS
2005,12.5,BLS
2010,11.9,BLS
2015,11.1,BLS
2020,10.8,BLS - slight COVID bump
2022,10.1,BLS - lowest since before NLRA
2023,10.0,BLS
2024,9.9,BLS - record low