I'm having difficulty with this question.

Suppose that in 2003, 968 workers were employed in the public sector, 700 of which were unionized. At that time public sector employees accounted for 20% of the labour force. This rose to 25% in 2013 while the public sector grew by 101 workers. By that time there were 100 union members in the public sector. A. Fill in the corresponding table: E I t E l t mp oymen mp oymen Union Density Union Density share share 2003 2013 2003 2013 private sector 20? 1 77 jobs % % o 0 public sector jobs % % % % B. The union density in 2003 was %. From 2003 to 2013 the change in union density was percentage points (Include the sign if not zero to indicate the direction of change). c. In this example, the counterfactual union density is %. From 2003 to 2013 the change in the propensity to unionize was percentage points (Include the sign if not zero to indicate the direction of change)