Evidence for absence from UK incl Annual Leave

[Angshuman]

Hi,
I am currently on TIER1 (GENERAL) and will be applying for ILR. In recent SET(O) form in section 6.3 they have clearly asked :

6.3 What evidence has been provided to support the reasons for all absences from the UK?
Letter(s) from employer(s) detailing reasons for work-related absences including periods of
paid annual leave from the UK?
Letter from applicant detailing reasons for absence due to compelling or compassionate reasons

Original official documents: (medical/birth/death certificate(s))
Letter from travel companies to evidence disruption to travel
Other
If you have ticked ‘Other’, please briefly specify below what evidence you have provided. Please
note only evidence of compelling or compassionate reasons must be listed in this box.

Does this mean I have to contact ALL my previous employers and get absence related letters based on my Travel from UK in past 6 years ?!!

Please help.

regards
Angshuman