Total Marks in different subject

Following are the total marks secured by the students in different subject for the last six years.
The total marks are represented in pie chart and histogram as follows:

Column1	Column2	Column3	Column4	Column5	Column6	Column7	Column8
	1990	1991	1992	1993	1994	1995	1996
Economics	50	60	70	30	40	50	60
Geography	90	20	50	78	90	40	80
Science	99	95	68	49	70	30	50
Mathematics	50	40	30	60	30	60	50
Commerce	60	40	70	50	70	80	90