Understanding Society User Support

Hi,

I am working on a project to potentially combine BHPS + UKHLS datasets with a specific interest in the variable jbpenm.

In the BHPS dataset, there is quite a large decline in sample size for the years 1992-1994 for those who respond "yes" which does not track with overall pension participation trends in the UK. It also doesn't track with the data 1994 onwards - this type of sudden decline is uncharacteristic of pension participation which tends to be stable over time albeit declining slowly over time beginning in the 2000s. I have checked the questionnaires to see if there was change in wording or routing which doesn't seem to be the case. I attach a document contain tabulation results for jbpen as a whole and by specific filters.

I was wondering if you might have some insights into what happened with this particular variable during these years?

Many thanks
Karen