in 2009
04-11/2009: 100%, 03/2009: 99,73%, 02/2009: 100%, 01/2009: 99,87%, 10-12/2008: 100%,

in 2008: 09/2008: 99,86%, 08/2007 - 08/2008: 100%

in 2007: 12-08/2007: 100%, 07/2007: 99,87, 06/2007: 100%, 05, 04: 99,8%, 03: 99,74%, 02-01/2007: 100%, 12-08/2006: 100%