What does this counter in docks mean?

It seems to go from 0 or 1 to 100, then it stops:

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The amount of resources the dock has available for trading. You can create trade boats at the dock and trade 20 wood/food/stone for a variable ammount of gold based on how far the docks are(similar to docks and markets in aoe 2) each time a boat trades it takes 20 resources from the dock and they slowly replenish over time