what's the mean of vxstat about write

I need a solution

vxvm 5.1rp1 on solaris 10,

vxstat output:

OPERATIONS BLOCKS AVG TIME(ms)

TYP NAME READ WRITE READ WRITE READ WRITE

2013-06-31 00:15:06 nodename

vol vol1 678082 10942170 51825547 351881947 2.2 0.2

vol vol2 9 7 343 20 3.0 0.1

vol vol3 18634 10910316 25915060 361987256 4.2 0.3

2013-06-31 00:15:16 nodename

vol vol1 678082 10942266 51825547 351884675 2.2 0.2

vol vol2 9 7 343 20 3.0 0.1

vol vol3 18634 10910412 25915060 361990085 4.2 0.3

2013-06-31 00:15:26 nodename

vol vol1 678082 10942516 51825547 351892067 2.2 0.2

vol vol2 9 7 343 20 3.0 0.1

vol vol3 18634 10910664 25915060 361997811 4.2 0.3

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in upper vxstat output, should we think data write on vol3 is 361997811blocks every 10s,or just (361997811-361990085) blocks every 10s.