When does Chopper join the crew?

Tony Tony Chopper first joined the Straw Hat Pirates crew as their doctor in episode 90 of the anime, titled “Hiriluk’s Cherry Blossoms! Miracle of the Drum Rockies” and in chapter 153 of the One Piece manga, titled “Hiriluk’s Sakura”.

What order would you say each of the Straw Hats joined the crew? Would you say Nami or Usopp joined first? Why? What about Robin? Do you base it off of when

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