Table:
0
A
B
C
D
E
1
Number of Options Outstanding (in thousands)
Weighted- Average Exercise Price Per Share
Weighted- Average Contractual Term (in Years)
Aggregate Intrinsic Value (in thousands)
2
Outstanding at December 31, 2016
7,384
$10.59
5.3
$74,065
3
Granted
25
23.99
4
Exercised
(1,722)
10.39
5
Canceled/Forfeited
(401)
16.04
6
Outstanding at December 31, 2017
5,286
$10.30
4.2
$201,480
7
Granted
-
-
8
Exercised
(1,138)
8.17
9
Canceled/Forfeited
(17)
18.79
10
Outstanding at December 31, 2018
4,131
$10.86
3.3
$295,921
11
Granted
-
-
12
Exercised
(1,742)
8.53
13
Canceled/Forfeited
(132)
2.73
14
Outstanding at December 31, 2019
2,257
$13.13
2.5
$351,428
15
Vested and expected to vest as of December 31, 2019
2,259
$13.13
2.5
$351,362
16
Excercisable as of December 31, 2019
2,243
$13.10
2.5
$349,002

Questions and formulas:
Question: What is the percentage change in the number of outstanding options between December 31, 2016 and 2017?
Formula: (B6- B2)/ B2 
Formula2: (B6- B2)/ B2 
Level: Calculation