Use the data in the table below to answer the questions that follow;

Age group	No of Students in thousands
	1955	1960
0 - 16	150	143
17 - 45	51	107
46 -60	29	33
above 60	15	17

(a) What is the percentage increase in the working population between 1955 - 1960?
(b) Calculate the ratio dependent population to the working population in 1955. 
(c) Calculate the ratio of dependent population to the working population in 1960.
(d) Has the dependency ratio increased or decreased between 1955 and 1960?