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31st July 92 was the cut off point 3.5% your allowed before that date. After that date its the manurfactures guides but the accepted one is 0.5 at idle and 0.3 at fast idle (2.5~3k)
And it doesn't mean you have to have one after that date, just means you have to take the stricter tests as Edde said. Of course you'll probably need one to pass, but if you could pass without one that's fine.