Format form depending on date change

[SnowPatrol]

Hi- this is probably simple but my brain has frozen. I want to use some kind of auto formatting on a form to separate groups of records based on when a date (in a YEAR box) has changed. Just to separate the records so the user isn't faced with one long form. I would be happy with a blank row, a line or the YEAR textbox changing colour every time the year value changes. I cannot work out how to achieve this.

Any help really really appreciated.

Thanks

Ali