MTBF - KB 4190 - 3 Month Rolling Average
Month - Jan 84 - Feb 86
27
 1,0,4,0,3,3,5,3,1,3,3,2,1,3,5,5,2,1,0,0,1,1,0,1,0,1,0
 0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,2,1,0