Prior to 1972, data are for people ages 21–24 with the exception of those ages 18–24 in Georgia and Kentucky, 19–24 in Alaska, and 20–24 in Hawaii. In 1972, with the passage of the Twenty-Sixth Amendment, the minimum voting age was reduced from 21 to 18 for all states. Prior to 1996, the CPS did not collect information on citizenship in a uniform way. Estimates for the citizenship population presented in this table prior to 1996 should be interpreted with caution, as they are not directly comparable to estimates from 1996 and after. Because of changes in the Current Population Survey race categories beginning in 2003, 2004–2020 data on race are not directly comparable with data from earlier years. Federal surveys now give respondents the option of reporting more than one race. Therefore, two basic ways of defining a race group are possible. A group such as Asian may be defined as those who reported Asian and no other race (the race-alone or single-race concept) or as those who reported Asian regardless of whether they also reported another race (the race-alone-or-in-combination concept). This table shows data for people who reported they were single race white and not Hispanic and people who reported single race Black. Use of single-race populations does not imply that it is the preferred method of presenting or analyzing data. For information on confidentiality protection, sampling error, nonsampling error, and definitions, see Complete Technical Documentation for the Current Population Survey.