Country K increased health-care provision in isolated rural communities. The table shows two indicators before and four years after the change.
| Indicator | Before | Four years after |
|---|---|---|
| Rural population able to reach health care within 60 minutes | 46% | 79% |
| Average working days lost through illness per worker each year | 8.4 days | 5.7 days |
Using the data, explain why these changes are evidence that Country K has experienced economic development.