Table:
|  |  | Consolidated |  |
| --- | --- | --- | --- |
|  | 2019 | 2018 | Change |
| Product Revenue | US$’000 | US$’000 | % |
| Altium Designer software licenses | 62,377 | 51,309 | 22% |
| Altium Designer subscriptions | 58,468 | 51,522 | 13% |
| Octopart search advertising | 17,940 | 11,968 | 50% |
| TASKING software licenses | 12,293 | 8,526 | 44% |
| TASKING maintenance | 5,741 | 4,709 | 22% |
| Altium Nexus | 6,635 | 4,848 | 37% |
| Service revenue | 3,655 | 4,833 | (25%) |
| Other | 4,710 | 2,461 | 91% |
| Total Product Revenue | 171,819 | 140,176 | 23% |
Paragraphs:
Net Profit After Tax
Net profit after tax increased by 41.1% to US$52.9 million from US$37.5 million in the previous year.
The effective tax rate for the year was 8% (2018: 6%). This reflects the tax utilisation of the deferred tax asset recognised as a result of both temporary differences arising on relocation of Altium’s core business assets to the USA. Altium will continue to utilize the tax benefits and re-evaluate the valuation of the deferred tax asset on an annual basis.
For more details on revenue, refer to Note 3 of the annual report.
Question:
What is the percentage change in the total product revenue from 2018 to 2019?
Answer: 23%