The debt ratio of Nvidia in the last 3 years has been steadily increasing. As of the latest data available in Q1 2023, the debt ratio stands at 45.14%. This indicates that the company has been relying more on debt financing than equity. However, the current debt ratio is still lower than its peak ratio of 49.3% in Q1 2021. It is important to monitor the company's debt levels and assess its ability to service its debt obligations.