ALWAYS start your analysis at the basics.
Do some summary tables so you understand the distributions and create graphs that show the trends over time overall and for the different states.
You can't do a basic linear regression because need to account for the multiple measurements at each state, PROC GLM. I think this is similar to your problem:
https://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#statug_glm_sect036.htm
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