Table:
|  | 2019 | 2018 |
| --- | --- | --- |
|  | % | % |
| Equity instruments | 53.9 | 58.5 |
| Debt instruments | 18.6 | 22.5 |
| Real estate | 10.8 | 3.5 |
| Cash and cash equivalents | 3.7 | 3.0 |
| Other | 13.0 | 12.5 |
| Total | 100.0 | 100.0 |
Paragraphs:
The average duration of the defined benefit obligation at the end of the reporting period is 6.8 years (2018: 6.3 years) which relates wholly to active participants.
The plan invests entirely in pooled superannuation trust products where prices are quoted daily. The asset allocation of the plan has been set taking into account the membership profile, the liquidity requirements of the plan, and risk appetite of the Group.
The percentage invested in each asset class is as follows:
Question:
What is the difference in debt instruments between 2018 and 2019?
Answer: 22.5% - 18.6%  = 3.9