A country's manufacturers improve the reliability of their products. The table shows the country's annual exports and imports of goods and services before and after the improvement. The balances on primary and secondary income are unchanged.
| Before improvement (£bn) | After improvement (£bn) | |
|---|---|---|
| Exports of goods and services | 84.6 | 88.1 |
| Imports of goods and services | 96.8 | 98.1 |
Calculate the change in the country's current account balance after the improvement.
Explain how the improvement in reliability could have contributed to this change.