Chicago-based Technomic’s Adult Beverage Resource Group reported that the Top 250 spirits brands grew 3.1 percent in total volume in 2011, which is slightly lower than the total market’s 3.5 percent increase. Deerfield, Ill.-based Beam Inc.’s Skinnygirl Cocktails outpaced all other brands with a 388 percent gain to break the 500,000 case mark and rank as the fastest-growing brand, according to Technomic.