The above rate increases happened even though the Tier 1 and Tier 2 rates went down between 2008 and 2009 and stayed the same between 2013 and 2014..

Over the last 10 years Jan 2008 to March 2018

Tier 1 increased 83% and over 8% yearly

Tier 2 increased 113% and over 11% yearly

Tier 3 increased 96%. and over 9% yearly