Calculating Capital Gains

[Katz]

Does anyone know of anywhere you can go to calculate capital growth in an area over the preceding 3/5 years ?

I am just selling an investment property that I lived in for a fews years and then subsequently rented out for 3 1/2 years. I need to determine the value as at 3 /1 2 years ago for Capital Gains tax purposes.

Anyone any ideas ?

Thanks