To get the view you want, right-click [Year] on the Columns shelf and select the first Year option.
Dates are a bit special, they can either create continuous axes (best for line graphs) or discrete bins. Tableau Desktop helps to visually distinguish between these two ways to present data by making continuous fields green and discrete fields blue. For more information about this, see Data Roles: Continuous vs. Discrete
For more information on why there are two sets of date options in the above menu, see Changing Date Levels
Hope this answers your question!