Contributions from Reserves (NIRC) is now our single largest source of revenue. It is unwise to over-depend on one source.
Reserves are our national savings – for a rainy day.
Our generation is benefiting from NIRC because past generations saved and grew the reserves.
We too should leave a fair amount to future generations - we balance this by using 50% and reinvesting 50% of our investment returns.
Link to NIRC chart.