SPY vs ES/SP Correllation

Does anyone know the correlation between ES or SP and SPY over past 20 years or so? I'm guessing its probably in the high 90% or something like that.

 

Is this a joke post?

 

No, no joke, SPY is not the same as ES or SP because its an ETF.

 

http://www.zerohedge.com/article/spy-vs-es-who’s-leading-sp-500

One among several articles a simple Google search returned.