Data Sources:

NFA - Lane-Milesi Database (2007)
Fiscal Balances - Economist (EIU)
Net Debt - Economist (EIU)
Dependency Ratio, Median Age, Life Expectancy, Fertility Rates - All UN Database


Notes regarding Graphs:

NFA/Y: 
1970 limited to countries with >= $20B GDP
1980 (>= $100B)
1990 (>= $100B)
2000 (>= $200B)
2005 (>= $300B)

Fiscal Balance / Y:
Same limits as above

Net Debt / Y:
Same Limits