The number of machine breakdowns per day at Yuwen Chen's factory is 0, 1, or 2, with probabilities 0.5, 0.3, or 0.2, respectively.
The following random numbers have been generated: 13, 14, 02, 18, 31, 19, 32, 85, 31, and 94.
Use these numbers to generate the number of breakdowns for 10 consecutive days. What proportion of these days had at least one breakdown?