低风险

较低风险

中风险

较高风险

高风险

2000

41.63%

31.91%

14.52%

7.09%

4.85%

2010

39.25%

30.06%

16.52%

8.56%

5.61%

2020

27.46%

19.26%

20.16%

13.50%

19.62%