From Apple's 2015 First Quarter Results statement:
"The results were fueled by all-time record revenue from iPhone® and Mac® sales as well as record performance of the App Store℠."
According to MacRumors.com:
"Apple sold a record 74.5 million iPhones during the quarter, up from 51 million a year earlier, while Mac sales were also strong with 5.5 million units sold, up from 4.8 million units in the year-ago quarter."
That's over 14% growth in Mac sales for the quarter year over year.