Keyword Analysis & Research: what year was the polio vaccine invented

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what year was the polio vaccine invented	0.42	0.9	6565	7	40
what	1.88	0.2	9544	50	4
year	0.17	0.7	3534	90	4
was	1.65	0.1	5414	37	3
the	1.2	0.3	3400	42	3
polio	1.08	0.5	2437	31	5
vaccine	1.54	0.3	2395	57	7
invented	1.62	0.8	9019	34	8

Keyword	CPC	PCC	Volume	Score
what year was the polio vaccine invented	0.87	0.2	1037	3
polio vaccine invented in which year	1.12	0.4	8171	68
polio vaccine year invented	0.67	0.1	1828	38