Table:
|  | Number of Shares | Weighted-Average Grant Date Fair Value |
| --- | --- | --- |
| Balance of restricted stock units outstanding at December 31, 2018 | 505,000 | $2.17 |
| Grants of restricted stock units | 70,000 | 2.45 |
| Vested restricted stock units | (235,000) | (2.29) |
| Balance of unvested restricted stock units at December 31, 2019 | 340,000 | 2.15 |
Paragraphs:
NOTE F – STOCKHOLDERS’ EQUITY (CONTINUED)
A summary of restricted stock units granted during the year ended December 31, 2019 is as follows (each restricted stock unit represents the contingent right to receive one share of the Company’s common stock):
Restricted stock unit compensation expense was $567,000 for the year ended December 31, 2019 and $687,000 for the year ended December 31, 2018.
The Company has an aggregate of $232,000 of unrecognized restricted stock unit compensation expense as of December 31, 2019 to be expensed over a weighted average period of 1.2 years.
Question:
What was the percentage change in balance of restricted stock units outstanding from 2018 to 2019?
Answer: (340000 - 505000) / 505000  = -32.67