According to Pacific Crest Securities (reported by AppleInsider), Mac sales grew over 100% year over year during the month of January. The firm based its numbers on recent NPD data which had implied that "year-over-year growth in Mac unit sales accelerated in January to 101 percent, up from 55 percent in December." More specifically, Mac notebook sales jumped 194% year over year in January. Additionally, the average selling price (ASP) for Macs appears to be increasing, which consequently is increasing revenues for Apple. While the numbers are hardly official, Hargreaves did note that over the past eight quarters, the first month of NPD data has been between 7% and 9% of Apple's reported quarterly Mac unit sales. Apple's last official quarterly earnings showed 28 percent growth in Mac sales.