What is the difference between "expected","we have expected"

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What is the difference between "expected","we have expected" and "expectation" in this sentence.
Please explain in Mandarin and provide a better answer.
1)Our roofing sales is two times higher than expected.
2)Our roofing sales is two times higher than we have expected .
3)Our roofing sales is two times higher than expectation.
3)Our roofing salaes i

这几种表达都是表示：比预期的要...只是用的时态和词性不同而已

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