The amount increases as the cylinder temperature decreases (however, the injection pressure decreases), but roughly speaking, about 1/3 will become dry ice. For more details, please refer to the Mollier diagram in Q&A of supercritical CO2 “How can we determine the phase and temperature of carbon dioxide during decompression?” (If the temperature is below the critical temperature of 31°C, start with the liquid state on the vapor pressure curve).