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Good afternoon and thanks for your question today.
Travel dates for the last 5 years is important because if you have been outside the UK a lot then you may not qualify for naturalisation
Those who are not married to a British citizen need to show that they have not been absent from the UK for more than 450 days during the five year residence period.
also, applicant cannot have been outside the UK for more than 90 days in the 12 months up to the date of their application.
Unfortunately, you can not leave it blank as it will affect your application. Do you remember dates roughly?
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It was nice to speak to you. As discussed please see the link: https://www.gov.uk/government/publications/requests-for-personal-data-uk-visas-and-immigration/request-personal-information-held-by-uk-visas-and-immigration
Please let me know what additional questions you have and I am happy to help