This was past month:
516 + 518*n 516 n=0 count=4454 1034 n=1 count=318 1552 n=2 count=129 2070 n=3 count=56 2588 n=4 count=35 3106 n=5 count=14 3624 n=6 count=6 4142 n=7 count=4 4660 n=8 count=6