20182017201620152014
Same-store sales growth6.2%4.1%12.9%5.8%-1.6%
Superstores same-store sales growth4.0%3.0%12.8%6.8%-0.9%
Small Format Stores same-store sales growth2.4%0.9%10.9%0.8%-5.0%

Notes:Same-store sales, referred to by the company as "comparable store sales," includes sales from stores open at least 12 months