Block 2017 - 4032 @ 2 NIB's
Block 4033 - 6047 @ 4 NIB's
Block 6048 - 8063 @ 8 NIB's
Block 8064 - 10079 @ 16 NIB's
Block 10080 - 12095 @ 32 NIB's *** Difficulty SHOULD reach 1+ at this point.  Total NIB's mined = 127,004
Block 12096 - 219555 @ 50 NIB's
Block 219556 - 639555 @ 25 NIB's