Refactored total volumes to reuse methods
Refactored total volumes to reuse methods

alphagov/transactions-explorer,gds-attic/transactions-explorer,gds-attic/transactions-explorer,gds-attic/transactions-explorer,alphagov/transactions-explorer,alphagov/transactions-explorer,gds-attic/transactions-explorer,gds-attic/transactions-explorer,alphagov/transactions-explorer,alphagov/transactions-explorer