The county auditor shall maintain and safeguard a file of voters in computer format that contains the information of each person registered in each voting precinct within the county. This file shall be known as the master registration file and shall be, at all times during office hours, open to public inspection. However, public access to social security numbers, driver license numbers, and dates of birth contained in the master registration file is prohibited. The master registration file shall contain all information from each voter's registration card. The master registration file shall also include the date of the last election the voter has voted in and when the voter's information was last updated. The master registration file may also contain additional voter history information. Any digital master registration file that contains: (1) The information from the voter registration card of reach individual registered to vote in the county; (2) The dates of the last four elections at which the individual has voted; (3) The date when the individual's voter information was last updated; and (4) Any application made by an individual to vote by absentee ballot, including: (a) The mailing address listed on the absentee ballot application form; (b) The absentee ballot requested on the application; (c) The date the absentee ballot was requested; (d) The date that the absentee ballot was returned; and (e) The method of absentee voting employed by the individual. 24 The master registration file must be open to public inspection, free of charge. An individual's social security number, driver license number, South Dakota nondriver identification number, or date of birth is not open to public inspection. The county auditor shall produce a record of all the information contained in the master registration file the day before any election scheduled within the county by 11:59 p.m. The county auditor shall maintain a rolling five-year archive of historical information from the master registration file. The county auditor shall keep a voter registration form for a purged or unregistered voter shall be kept for twenty-two months. No purged or unregistered voter may be included in the master registration file.