You can get this from line 16 in Part 4 of your Schedule 3 for 2000, or from your notice of assessment or latest notice of reassessment for 2000. If you don't have access to either of these, you can contact the CRA. If you are in Canada or the United States, you can call the Canada Revenue Agency (CRA) at 1-800-959-8281. If you are elsewhere you can call 613-940-8495. This page has more ways to contact the CRA: https://www.canada.ca/en/revenue-agency/corporate/contact-information/telephone-numbers.html