Almost 10%. Framed like that it almost seems highly inefficient that so many are routed through this one station in particular. Presumably they could have had more direct routes to their destinations.

And for context Tokyo is a huge metro. It can be 40 minutes between 2 places directly that any other country would consider cities by themselves. There is no such thing as CBD or downtown here IMO. This makes it more odd so many people route through one place.