Scottish Provident UK new business figures are up 19 per cent on 1997.
Annualised premiums rose to £69m from £58m in 1997. Worldwide business was up by 32 per cent to £153m from £116m in 1997.
The life office believes the figures reinforce its commitment to remaining mutual.
Group managing director David Woods says: "Scottish Provident UK's focus on protection products has been remarkably but deservedly successful and continues to make an enormous contribution to the overall success of the group.
"Our profitable new business growth demonstrates that mutual which have developed a clear strategy can achieve success in their chosen markets."