For continuous data axes centrally align labels over tick marks.
For categorical data axes labels should be aligned between tick marks.
You can use more tick marks than labels; ticks indicate the scale or level of detail of the data.
Label the final tick if there are more ticks than labels and there is space to do so.
Economic inactivity rate for people aged 16 to 64 years
UK, January 1980 to October 2014