File statistics

Hello,

when I look at a file with DSPFD, there also is an area with activity 
statistics:

Data Space Activity Statistics  . . . . . :  
  Data space size in bytes  . . . . . . . :         2283806720  
  Physical file open accesses . . . . . . :                            90  

  Physical file close accesses  . . . . . :                            88  

  Write operations  . . . . . . . . . . . :                         6.333  

  Update operations . . . . . . . . . . . :                     3.139.075  

  Delete operations . . . . . . . . . . . :  
  Logical Reads . . . . . . . . . . . . . :                     5.578.715  

  Physical Reads  . . . . . . . . . . . . :                       132.836  

  

Does anybody know when these statistic data are cleared/reset?

Regards,

Oliver