pre_text: SIGNIFICANT ASSUMPTIONS We used the following key assumptions to measure the post-employment benefit obligations and the net benefit plans cost for the DB pension plans and OPEB plans. These assumptions are long-term, which is consistent with the nature of post-employment benefit plans. (1) Cost of living indexation rate is only applicable to DB pension plans The weighted average duration of the post-employment benefit obligation is 14 years. We assumed the following trend rates in healthcare costs: • an annual increase in the cost of medication of 6.5% for 2019 decreasing to 4.0% over 20 years • an annual increase in the cost of covered dental benefits of 4% • an annual increase in the cost of covered hospital benefits of 3.7% • an annual increase in the cost of other covered healthcare benefits of 4% Assumed trend rates in healthcare costs have a significant effect on the amounts reported for the healthcare plans.
table: DB PENSION PLANS AND OPEB PLANS
table: FOR THE YEAR ENDED DECEMBER 31 2019 2018
table: Post-employment benefit obligations
table: Discount rate 3.1% 3.8%
table: Rate of compensation increase 2.25% 2.25%
table: Cost of living indexation rate (1) 1.6% 1.6%
table: Life expectancy at age 65 (years) 23.2 23.1
question: Analyse this data from a financial earnings document. For post-employment benefit obligations, what is the percentage change in the life expectancy at age 65 in 2019?