A small feature update:
Added a diagram of Debt/Equity ratio history.
The data of US companies are from MacroTrend and the data of CA companies are from YCharts. YCharts uses an atypical formula (Long Term Debt + Current Portion of Long Term Debt) / Total Shareholders' Equity, therefore its data is different to other sources. But I haven't found a better CA data source yet.
Added a diagram of Debt/Equity ratio history.
The data of US companies are from MacroTrend and the data of CA companies are from YCharts. YCharts uses an atypical formula (Long Term Debt + Current Portion of Long Term Debt) / Total Shareholders' Equity, therefore its data is different to other sources. But I haven't found a better CA data source yet.