Quality control	
82.0	
78.3	
73.5	
74.4	
72.6	
79.8	
77.0	
83.4	
76.2	
75.2	
81.5	
69.8	
71.3	
69.4	
82.1	
77.6	
76.9	
77.1	
72.7	
73.6