Table:
|  | For the Year Ended |  |
| --- | --- | --- |
|  | December 31, 2019 | December 31, 2018 |
|  | (in thousands, except per share amounts) |  |
| Revenues | $2,303,737 | $2,111,373 |
| Net income | $464,602 | $442,082 |
| Net income per common share: |  |  |
| Basic | $2.73 | $2.36 |
| Diluted | $2.59 | $2.30 |
Paragraphs:
Pro Forma Information
The following unaudited pro forma information gives effect to the acquisition of AutoGuide as if the acquisition occurred on January 1, 2018 and the acquisition of MiR as if the acquisition occurred on January 1, 2017. The unaudited pro forma results are not necessarily indicative of what actually would have occurred had the acquisition been in effect for the periods presented:
Pro forma results for the year ended December 31, 2019 were adjusted to exclude $1.2 million of AutoGuide acquisition related costs and $0.1 million of AutoGuide non-recurring expense related to fair value adjustment to acquisition-date inventory.
Pro forma results for the year ended December 31, 2018 were adjusted to include $1.2 million of AutoGuide acquisition related costs and $0.4 million of AutoGuide non-recurring expense related to fair value adjustment to acquisition-date inventory.
Pro forma results for the year ended December 31, 2018 were adjusted to exclude $2.9 million of MiR acquisition related costs and $0.4 million of MiR non-recurring expense related to fair value adjustment to acquisition-date inventory.
Question:
What was the percentage change in diluted net income per common share from 2018 to 2019?
Answer: (2.59-2.30)/2.30 = 12.61