Formula to extract data according to dates

Need a solution,
Need to sort local election results,
I have one column with the voting history dates for each registered voter for several years, I’m trying break up the voting dates to able to see which voter voted in which election/year, each date is separated with a semicolon in the same cell, see below example,
Row 1 has,
20161108 GE;20131105 GE;20130910 PR;20121106 GE;20101102 GE
Row 2 has,
20170912 PR;20161108 GE;20160913 PR;20141104 GE;20131105 GE;20130910 PR;
Row 3 has,
20161108 GE;20120320 SP;20081104 GE;General Election 2005;General Election 2004
I’m looking for a formula that will do text to column and leave blank cells for the missing years, so that column B will have all the 2017 dates column C will have all 2016 dates, so that column D will have all the 2015 dates.
note: date are left to right, high to low
Please let me know if you have a solution for me,

thank you very much

=--ISNUMBER(SEARCH(B$1,$A2))
in row1 there are years