What percentage of the total liabilities related to defined benefit plans is recognized in current (as opposed to non-current) liabilities? During 2015, defined benefits obligations decreased (at least in part) due to actuarial gains? What do these gains reect? Please be specific about the assumptions that changed and the direction of those changes. If the rate of increase in pensionable remuneration was 6%, as opposed to 5%, in 2015, what would be the total defined benefit obligation? Would a similar increase in pensionable remuneration assumption in 2014 have the same incremental effect on the total benefit obligation at the end of 2014? Please justify your answer numerically, and explain why that is the case. What was the total return on plan assets during 2015? What portion of this return was recognized in the income statement? What was the amount of pension benefits earned by Shell's employees during fiscal year 2015