how many leap seconds have been added

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
how many leap seconds have been added	0.85	0.5	9372	33	37
how	0.22	1	3080	21	3
many	1.26	0.5	8500	85	4
leap	1.12	0.7	4809	71	4
seconds	0.34	0.1	3258	26	7
have	1.25	1	35	66	4
been	1.53	0.8	9036	32	4
added	0.8	0.4	7813	57	5

Keyword	CPC	PCC	Volume	Score
how many leap seconds have been added	1.33	0.6	7446	25
when are leap seconds added	1.41	0.8	5541	51
how many seconds in leap year	0.47	0.3	4566	59
current number of leap seconds	0.25	0.7	2291	19
how often are leap seconds	1.1	0.2	2868	99
how often is a leap second added	1.29	0.3	5206	14
number of seconds in a leap year	0.17	0.2	5212	37
leap seconds per year	1.49	0.5	6705	93
list of leap seconds	1.61	0.7	2268	19
who adds leap seconds	0.51	0.4	2251	57
how many leap seconds since 1970	1.56	0.9	3151	27
leap seconds since 2000	0.87	1	4887	30
table of leap seconds	0.78	0.7	8483	60
how many times leap year comes	1.24	0.6	5449	57
leap seconds since 1980	0.84	0.2	1831	98
leap-seconds.list	0.4	0.4	2020	16