06/05/2015 05:12 EDT | Updated 06/05/2016 05:59 EDT

Key facts and figures from Michael Ferguson's audit of Senate spending

OTTAWA - The contents of auditor general Michael Ferguson's explosive forensic examination of Senate expense reports spanning the period April 2011 to March 2013, by the numbers:

116: Senators who were subject to the audit

7: Retired senators whose expenses are being referred to the RCMP

2: Sitting senators whose expenses are being referred to the RCMP

21: Additional senators whose expenses have been flagged as problematic

80,000: Transactions reviewed by auditors

$976,627: Total sum of questionable claims flagged by auditors

$546,000: Approximate sum of questionable claims associated with just five of the senators named in the audit

$176,014: The highest single total of disputed expenses claimed by one senator — retired Liberal Rod Zimmer

2: Years the audit took to complete

$400,000: Amount auditors say the Senate could have saved on per diems, telecommunications and holiday greeting cards with different rules in place

$21 million: Reported cost of the audit