Gets a ratio of how wide to draw the candlesticks relative to the horizontal axis's category widths, as a percentage in the range of 0 to 1.
A value of 1 uses the entire space, while a value of 0.6 uses 60% of the column's available space. The actual candlestick width used is the smaller of the columnWidthRatio property and the maxColumnWidth property. Multiple candlestick series divide this space proportionally. The default value is 0.65.