all within 24 hoursNearly three daysNearly a weekNearly one monthOther

all <20002000-30003000-45004500-60006000-80008000-1000010000-1500015000-2000020000-3000030000-40000>50000

all Inexperience1-3 Years3-5 Years5-10 YearsMore than 10 years

all Junior high school and belowHigh School / Chinese Technology / Secondary SchoolCollegeBachelormasters degreeDoctor

all Less than 50 people50-149 people150-499 people500-999 people1000-5000 peopleMore than 5,000 people