62.9. For the purposes of sections 62.5, 63.3 and the sections that refer to section 63.3, a contributory period is, for each year prior to 2010, the number of contributory days in the period during which the officer participated in the plan in a year or in the period during which days and parts of a day were otherwise credited to the officer with contributions, except the days and parts of a day determined by regulation, over the number of contributory days in the year concerned, that is, 200 or 260 depending on the basis of remuneration for the employment. The contributory period of a new officer for the year during which the officer becomes a member of the plan begins on the first day in respect of which the officer contributed or was exempt from contributions and the last period ends on the last day credited in the year during which the officer ceases to participate in the plan.