818R17. In Chapters II to XIV, XVI and XX, the life insurance surplus factor, for a taxation year, of a life insurer not resident in Canada means,(a) subject to section 818R20, where the insurer, pursuant to this paragraph, elects for the year in the manner provided for in section 818R19, the proportion, expressed as a percentage, that the excess amount determined under section 818R18 is of the excess amount referred to in the second paragraph of section 818R18;
(b) where the insurer does not make for the year the election provided for in paragraph a but has made such an election for one of the 4 preceding taxation years and, since the last taxation year in respect of which it has made that election, it has not selected, pursuant to this paragraph, the percentage referred to in paragraph c as life insurance surplus factor for one of those preceding years, the percentage selected by it for the year and being either the percentage determined in paragraph c or the percentage determined pursuant to paragraph a in respect of the last taxation year for which it has made the election provided for in the said paragraph a; and
(c) in the other cases, the percentage of 10%.