Looking at the case-count view of CINETHP, it seems that 2015 version of the variable is somewhat weird.
Excluding NIU, the percentage of having access to internet is 79% in 2013, but drops to 68 percent in 2015.
This is really weird because the rate remains about 80% in 2015 if I look at the ACS version of the variable.(https://usa.ipums.org/usa-action/variables/CINETHH#codes_section)
Do you have any ideas why this is happening? Maybe this is because of the change in the interview questionnaire?