Period from 1st January 2005 to 31st December 2006: 4.5%

Period from 1st January to 31st December 2007: 5.5%

Period from 1st January to 31st December 2008: 5.75%

Period from 1st January to 31st December 2009: 6%

Period from 1st January to 31st December 2010: 4%