Do you listen to music?

	quantity
	year	89	90	91	92	93	94	95	96	97	98	99	00	01	02	03	04	05	06	07	08	09	10
	computer	C	64	..	A5	00	..	..	..	..	..	..	PC	..	..	..	..	..	..	..	..	..	..