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The output of your command "$ vmstat 1 3" is:

procs -----------memory---------- ---swap-- -----io---- -system-- -------cpu-------
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st gu
 0  0   1036 449940 362888 22792300    0    0    57    58  324    0  0  0 99  0  0  0
 0  0   1036 447924 362888 22792300    0    0     0     0  842  208  0  0 99  0  0  0
 0  0   1036 457224 362888 22792312    0    0     0     0  738  165  0  0 100  0  0  0