It’s “official”: the number of rich people in Dallas went down last year. According to a San Diego-based market-research firm called Claritas, Dallas had 83,594 millionaire households in ‘08–1.4 percent fewer than the year before. But, here’s the silver lining: Claritas says the number of millionaire households here will increase by a whopping 31 percent in the next five years. Meantime, Houston’s millionaire households (73,601 now, up 2.3 percent from ‘07) are expected to grow 33 percent in five years. Good luck with all that.