Another random but cool way to look at the turnaround Underwood was able to engineer here. Below is the Big Ten ranked by weeks in the AP Poll since the 2019-20 season, regardless of the time period covered (i.e., 2019-20 is just one year, 2020-21 includes two seasons, etc.). For context, I also included the rank nationally (tiebreakers for teams is overall record for a single season or how recently they were ranked or higher final rank).
2018-2019 ONLY
#1 Michigan State - 20
#1 Michigan - 20
#15 Wisconsin - 15
#20 Iowa - 13
#22 Purdue - 12
#25 Maryland - 11
#26 Ohio State - 8
#28 Indiana - 6
#32 Oregon - 4
#37 UCLA - 3
#37 Nebraska - 3
#42 Washington - 2
NR Minnesota
NR USC
NR Rutgers
NR Penn State
NR Northwestern
NR Illinois
2018-19 & 2019-2020
#5 Michigan State - 38
#10 Maryland - 31
#11 Michigan - 29
#16 Oregon - 24
#16 Ohio State - 24
#16 Iowa - 24
#24 Wisconsin - 18
#32 Purdue - 13
#38 Penn State - 10
#39 Illinois - 8
#39 Washington - 8
#43 Indiana - 6
#54 Nebraska - 3
#54 UCLA - 3
#61 Rutgers - 2
NR USC
NR Minnesota
NR Northwestern
2019-2020 ONLY
#1 Maryland - 20
#1 Oregon - 20
#11 Michigan State - 18
#12 Ohio State - 16
#24 Iowa - 11
#25 Penn State - 10
#26 Michigan - 9
#28 Illinois - 8
#30 Washington - 6
#38 Wisconsin - 3
#41 Rutgers - 2
#44 Purdue - 1
NR Indiana
NR UCLA
NR USC
NR Nebraska
NR Minnesota
NR Northwestern
(Since 2019-2020 Starting Now)
2020-2021
#5 Ohio State
#10 Iowa - 28
#12 Oregon - 27
#14 Illinois - 25
#14 Michigan State - 25
#17 Michigan - 24
#21 Maryland - 20
#24 Wisconsin - 18
#35 Rutgers - 10
#35 Penn State - 10
#39 Purdue - 6
#39 Washington - 6
#44 Minnesota - 5
#44 USC - 5
#49 UCLA - 4
#61 Northwestern - 1
NR Indiana
NR Nebraska
2021-2022
#5 Ohio State - 47
#11 Illinois - 38
#13 Michigan State - 37
#15 Wisconsin - 33
#16 Iowa - 32
#21 Oregon - 29
#22 Michigan - 28
#23 Purdue - 25
#27 USC - 23
#27 UCLA - 23
#29 Maryland - 22
#44 Rutgers - 10
#44 Penn State - 10
#52 Washington - 6
#55 Minnesota - 5
#66 Northwestern - 1
NR Indiana
NR Nebraska
2022-2023
#10 Ohio State - 51
#15 Illinois - 45
#16 Purdue - 42
#16 UCLA - 42
#19 Michigan State - 39
#20 Wisconsin - 38
#24 Iowa - 33
#27 Michigan - 30
#27 Oregon - 30
#30 Maryland - 27
#34 USC - 23
#42 Indiana - 16
#50 Rutgers - 12
#51 Penn State - 10
#58 Washington - 6
#61 Minnesota - 5
#74 Northwestern - 2
NR Nebraska
2023-2024
#9 Illinois - 65
#12 Purdue - 63
#19 Ohio State - 51
#20 Wisconsin - 50
#22 UCLA - 42
#22 Michigan State - 42
#26 Iowa - 33
#30 Oregon - 30
#30 Michigan - 30
#35 Maryland - 27
#36 USC - 26
#49 Indiana - 16
#56 Rutgers - 12
#57 Penn State - 10
#64 Washington - 6
#69 Minnesota - 5
#76 Northwestern - 3
NR Nebraska
2024-2025
#9 Purdue = 84
#11 Illinois - 75
#15 Wisconsin - 65
#19 Michigan State - 58
#22 Ohio State - 52
#24 UCLA - 48
#27 Michigan - 43
#28 Oregon - 41
#31 Maryland - 35
#32 Iowa - 33
#42 USC - 26
#48 Indiana - 20
#57 Rutgers - 15
#62 Penn State - 10
#68 Washington - 6
#72 Minnesota - 5
#78 Northwestern - 3
NR Nebraska
2025-2026
#6 Purdue - 104
#10 Illinois - 95
#15 Michigan State - 78
#16 Wisconsin - 72
#21 Michigan - 63
#26 UCLA - 53
#27 Ohio State - 52
#32 Oregon - 41
#34 Iowa - 36
#42 USC - 28
#50 Indiana - 22
#59 Nebraska - 15
#59 Rutgers - 15
#65 Penn State - 10
#77 Minnesota - 5
#83 Northwestern - 3
So yeah, most people will probably see this as a weird, pointless exercise, but I love looking at things like this with interesting stats (guess that's the consultant / analyst in me!). I think it's a cool visual to see the huge shifts with some programs, like OSU going from consistently leading the league in the early part of the decade to now being middle of the pack and outside of the top 25 nationally ... or Nebraska holding out as the only team in the league not ranked this decade and then exploding to tie Rutgers' 15 weeks in one season!

It's a shame 2023 and 2025 had such long slump periods, or we would probably be at #1 ... if Purdue stays unranked for most of the year, we will almost certainly take the lead back!
But as it relates to Illinois, heading into the 2020 season, we had just finished last in the league and hadn't finished a season ranked in almost 15 years ... fast forward 7 seasons later, and we are top 10 in the nation as far as spending time in the AP Poll and #2 in the Big Ten. I try to remember how B-A-D we were and just how grateful I feel to have that swagger again that I had circa 2005 as a junior high fan among a sea of Iowa fans in Iowa City!! Here's another way of showing the Illini resurgence! Adding context after the "..." to REALLY show how crazy this turnaround has been.
2018-2019 - NR nationally and #18 in Big Ten
2019-2020 - #28 nationally and #8 in Big Ten ... first NCAAT since 2012-2013
2020-2021 - #14 nationally and #5 in Big Ten ... first BTT Championship since 2004-2005
2021-2022 - #11 nationally and #2 in Big Ten ... first Big Ten Championship since 2004-2005
2022-2023 - #15 nationally and #2 in Big Ten
2023-2024 - #9 nationally and #1 in Big Ten ... first Elite Eight since 2004-2005 and another BTT Championship
2024-2025 - #11 nationally and #2 in Big Ten
2025-2026 - #10 nationally and #2 in Big Ten ... first Final Four since 2004-2005