Cost of 4-room flat in 1960, 1970, 1980, 1990, 2000, 2010 on a psf basis.
If in 1960, it costs $20,000 for 100 sq m and today costs $800,000 for 80 sq m, then the actual cost increase is from $200 sqm to $1000 sqm over a span of 50 years. This works out to an annual inflation rate of ???.
If you feel that is too far-fetched, then compare 1990 with 2010. Better still, compare on the basis of Ministers. When Minister so and so was in office, the price of flat is ??sqm and tabulate it on the basis of the Ministers. You can then see their key indicators.
Interesting point to tabulate it by Ministers. This can be done for housing, medical care, transport. You can also do a comparison table on Prime Ministers on any key indicators you like though it depends on the public to determine if you are talking sense or nonsense.
I think tabulating on the basis of Ministers makes some sense when you compare their relative effectiveness across similar talents.