select st_numpoints(ST_Subdivide(wkb_geometry, 200)) from (select wkb_geometry from contour where st_numpoints(wkb_geometry) > 5000 limit 1) as foo;

 st_numpoints
--------------
            2
           80
          158
           19
           99
           93
          142
            2
           92
          125
           20
          132
          132
            6
          126
           51
          182
          191
          101
            2
          145
           78
           21
           77
           31
           77
          170
          153
          106
           11
           25
           85
          106
           91
           38
          124
           37
          174
          179
            7
           82
           40
           90
           11
           69
            2
          113
          114
            4
          153
          130
           87
          145
           69
...