Answer, because Clinton started it a year before.
Let me add that Bush’s economy is climbing, and that is despite being handed a falling economy, despite corporate scandals that killed consumer confidence, and despite September 11, 2001 attacks.
Clinton, on the other hand, did nothing for the economy. He road on the dot com wave, and that bubble burst his last year in office. He also enjoyed huge corporate profits, like Enron, that were total lies.