65岁及以上人口比例的字数限制在15字以内

国家|比例
中国|19.8%
印度|7.5%
美国|17.4%
日本|30.2%
user
```json
{
  "country_ratio": [
    {"country": "中国", "ratio": "19.8%"},
    {"country": "印度", "ratio": "7.5%"},
    {"country": "美国", "ratio": "17.4%"},
    {"country": "日本", "ratio": "30.2%"}
  ]
}
```
assistant