For the state of Iowa, how different is the U.S official unemployment rate (as of January, 2021 U.S. unemployment rate was 6.3%) from Iowa's U4, U5, and U6 rates?What does it mean? Interpret U4, U5, and U6 individually.

Alternative measures of labor underutilization by state, 2020 annual averages (percent) State Measure U-1 U-2 U-3 U-4 U-5 U-6 United States 2.8 6.1 8.1 8.4 9.2 Alabama 13.6 1.9 4.3 6.0 6.2 6.7 Alaska 9.5 2.5 5.4 7.7 8.2 9.6 Arizona 13.7 2.4 5.2 7.7 7.9 8.8 Arkansas 13.0 1.9 4.2 6.2 6.5 California 7.0 10.0 4.1 3.1 10.2 10.6 11.5 Colorado 17.1 2.3 5.5 7.3 7.5 7.9 Connecticut 13.7 3.2 5.9 7.8 8.3 9.2 Delaware 14.1 2.5 6.1 7.8 8.0 8.6 District of Columbia 13.3 3.8 5.0 7.9 8.3 Florida 9.4 12.4 2.8 6.2 7.9 8.5 9.4 Georgia 14.3 2.2 4.6 6.6 7.0 7.7 Hawaii 12.5 5.3 10.1 11.7 11.9 Idaho 12.9 19.4 1.2 3.2 5.2 5.2 Illinois 5.6 9.8 3.1 7.1 9.1 9.4 Indiana 10.0 14.1 1.8 5.4 7.1 7.3 7.9 Iowa 11.5 1.5 3.9 5.4 5.6 6.3 9.7The six state measures are based on the same denitions as those published for the United States: - Ul, persons unemployed 15 weeks or longer, as a percent of the civilian labor force; 0 U2, job losers and persons who completed temporary jobs, as a percent of the civilian labor force; 0 U3, total unemployed, as a percent of the civilian labor is rce (this is the denition used for the official unemployment rate]; 0 U4. total unemployed plus discouraged workers, as a percent of the civilian labor force plus discouraged workers; 0 U5, total unemployed, plus discouraged workers, plus all other marginally attached workers, as a percent of the civilian labor force plus all marginally attached workers; and o US, total unemployed, plus all marginally attached workers, plus total employed part time for economic reasons, as a percent of the civilian labor force plus all marginally attached workers