Satisfaction:			Usage Level:		
1995	1996	1997	1995	1996	1997
5	4	7	50	80	90
4	3	8	50	90	90
7	3	9	50	70	90
5	5	9	60	90	90
6	6	9	40	80	90
8	8	9	40	70	90
8	7	9	60	70	80
5	3	7	60	80	90
6	3	9	50	80	80
5	4	6	50	60	70