Uneven Cassandra load

Should a three node Cassandra cluster with a replication factor of 3 have the same load value for all three nodes?

We are using a random partitioner and NetworkTopologyStrategy. Nodetool ring shows equal values for "Owns" but unequal values for "Load".

Load            Owns    Token                                       
                        113427455640312821154458202477256070484     
16.53 GB        33.33%  0                                           
14.8 GB         33.33%  56713727820156410577229101238628035242      
15.65 GB        33.33%  113427455640312821154458202477256070484

Running nodetool repair and cleanup on each node brought the load a little closer but it still seems quite unbalanced.

Is this considered normal?