Ends sales volume reached 55 billion pieces

Ends sales volume reached 43 billion pieces

Ends sales volume reached 40 billion pieces

Ends sales volume reached 34.5 billion pieces

Ends sales volume reached 26 billion pieces

Ends sales volume reached 21.2 billion pieces

Ends sales volume reached 18.8 billion pieces

Ends sales volume reached 16 billion pieces

Ends sales volume reached 13.3 billion pieces

Ends sales volume exceeded 10 billion pieces

Ends sales volume reached  8.5 billion pieces

Officially put into production in May Annual ends sales volume reached  3.2 billion pieces