Table:
| As at December 31, | Pension 2019 | Other 2019 | Pension 2018 | Other 2018 |
| --- | --- | --- | --- | --- |
| Actuarial benefit obligation |  |  |  |  |
| Discount rate | 3.20% | 2.95% to 3.20% | 3.80% | 3.80% to 4.00% |
| Benefit costs for the year ended |  |  |  |  |
| Discount rate | 3.90% | 3.90% to 4.00% | 3.60% | 3.25% to 3.60% |
| Future salary growth | 2.50% | N/A | 2.50% | N/A |
| Health care cost trend rate | N/A | 3.49% to 5.49% | N/A | 4.50% |
| Other medical trend rates | N/A | 4.00% to 4.56% | N/A | 4.50% |
Paragraphs:
The following are the significant assumptions adopted in measuring the Company’s pension and other benefit obligations:
For certain Canadian post-retirement plans the above trend rates are applicable for 2019 to 2024 which will increase linearly to 4.75% in 2029 and grading down to an ultimate rate of 3.57% per annum in 2040 and thereafter.
Question:
What is the percentage change in the pension discount rate for actuarial benefit obligations between 2018 and 2019?
Answer: 3.20 - 3.80  = -0.6