Q2 2018Q1 2018Q4 2017Q3 2017Q2 2017
Same-store sales growth-1.8%-5.9%-14.1%-6.9%-5.4%
Constant currency same-store sales growth2.5%-4.9%-13.6%-6.4%-5.6%
North America same-store sales growthN/AN/AN/AN/AN/A
Europe same-store sales growthN/AN/AN/AN/AN/A
Japan same-store sales growthN/AN/AN/AN/AN/A

Notes:Same-store sales, referred to by the company as "comparable store sales," includes sales from stores open for one full year after the end of the first month of its operations