original: riaa website although total worldwide album sales are not calculated by any single entity , as of 2004 several industry sources estimated rush 's total worldwide album sales at over 40 million units .
simplifications: although total worldwide album sales are not calculated by any single entity , as of 2004 several industry sources estimated rush 's total worldwide album sales at over 40 million units . as of 2004 , several industry sources estimated rush 's total worldwide album sales are over 40 million units even though they are not calculated by any single entity by the riaa website the recording industry association of america website : although total worldwide album sales are not counted by any one means , as of 2004 a number of industry sources have estimated rush 's total worldwide album sales at over 40 million units . as of 2004 , rush 's total worldwide album sales were over 40 million units . although total worldwide album sales are not calculated by any single entity , as of 2004 several industry sources estimated rush 's album sales at over 40 million units . total worldwide album sales are not calculated by any single entity , however the riaa website mentions that as of 2004 several industry sources estimated rush 's total worldwide album sales at over 40 million units . on the riaa website , total worldwide album sales are not calculated by any single entity and as of 2004 several industry sources estimated rush 's total worldwide album sales at over 40 million units . although album sales are not totalled by any single group , in 2004 industry sources put rush 's worldwide sales at over 40 million units .