Table:
0
A
B
C
D
1
Number of Unvested Shares 
Weighted Average Grant Date Fair Value
Aggregate Grant Date Fair Value of Unvested Shares
2
Balance at January 1, 2017
489,698
$1.51
738,345
3
Granted
296,287
$3.07
$909,600
4
Vested
(312,365)
$1.45
$(454,339)
5
Forfeitures
(15,000)
$1.41
$(21,150)
6
Balance at December 31, 2018
458,620
$2.56
$1,172,456
7
Granted
291,600
$3.75
$1,094,430
8
Vested
(210,619)
$2.33
$(490,769)
9
Forfeitures
(37,499)
$2.96
$(111,115)
10
Balance at December 31, 2019
502,102
$3.32
$1,665,002

Questions and formulas:
Question: What is the change in Number of Unvested Shares from Balance at January 1, 2017 to December 31, 2018?
Formula: B6-B2
Formula2: B6-B2
Level: Calculation
Question: What is the average Number of Unvested Shares for Balance for January 1, 2017 and December 31, 2018?
Formula: (B6+B2) / 2
Formula2: (B6+B2) / 2
Level: Calculation
Question: What is the change in Weighted Average Grant Date Fair Value between the unvested shares in January 1, 2017 and those at December 31, 2018?
Formula: C2-C6
Formula2: C2-C6
Level: Calculation