Which tank has the shortest W cooldown?

Tanks only. Cooldowns at rank 1. Charge abilities are left out.

• 1

  Amumu DespairW

  1s
• 2

  Zac Unstable MatterW

  5s
• 3

  Rammus Defensive Ball CurlW

  7s
• 4

  Sejuani Winter's WrathW

  9s
• 5

  Malphite ThunderclapW

  10s
• 6

  Rell Ferromancy: Crash DownW

  10s
• 7

  Skarner Seismic BastionW

  10s
• 8

  Cho'Gath Feral ScreamW

  11s
• 9

  Braum Stand Behind MeW

  12s
• 10

  Nautilus Titan's WrathW

  12s
• 11

  Ornn Bellows BreathW

  12s
• 12

  Alistar HeadbuttW

  14s
• 13

  K'Sante Path MakerW

  14s
• 14

  Leona EclipseW

  14s
• 15

  Maokai Twisted AdvanceW

  14s
• 16

  Nunu & Willump Biggest Snowball Ever!W

  14s
• 17

  Blitzcrank OverdriveW

  15s
• 18

  Sion Soul FurnaceW

  15s
• 19

  Shen Spirit's RefugeW

  16s
• 20

  Dr. Mundo Heart ZapperW

  17s
• 21

  Singed Mega AdhesiveW

  17s
• 22

  Galio Shield of DurandW

  18s
• 23

  Poppy Steadfast PresenceW

  20s
• 24

  Tahm Kench Abyssal DiveW

  21s