Historical Composition of the S&P 500

Hi Guys,

I am conducting backtests on stocks that are members of the S&P 500.

To avoid any survivor bias I am looking for the historical composition of the S&P 500 dating back to the 90's to now.

This kind of information is not available on standardandpoors.com.

Do you know where I can find this type on information ?

Many thanks

Sebastien
 
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