Avg sales per store (M)$2,270$2,312$2,576$2,928$3,187$3,784
Avg sales per store growth-5.0%-10.3%-12.0%-8.1%-15.8%-25.7%
Avg sales per square foot$859$874$970$1,096$1,186$1,397
Avg sales per square foot growth-4.9%-9.8%-11.5%-7.6%-15.1%-19.4%

Notes:The company changed its fiscal year end from Dec 31 to Mar 31. Fiscal years 2014 and prior represent the twelve months ended on Dec 31, while fiscal 2015 represents the 12 months ended on Mar 31, resulting in a transitory quarter being omitted from annual results.