"age"	"smoke"	"n"	"y"	"ns"
"40"	0	18790	2	0
"50"	0	10673	12	0
"60"	0	5710	28	0
"70"	0	2585	28	0
"80"	0	1462	31	0
"40"	1	52407	32	52407
"50"	1	43248	104	43248
"60"	1	28612	206	28612
"70"	1	12663	186	12663
"80"	1	5317	102	5317