- 21% - Very difficult
- 35% - Somewhat difficult
- 27% - Not very difficult
- 16% - Not at all difficult
- 18% - Very difficult
- 33% - Somewhat difficult
- 30% - Not very difficult
- 19% - Not at all difficult
- 12% - Very difficult
- 31% - Somewhat difficult
- 36% - Not very difficult
- 21% - Not at all difficult
- 9% - Very difficult
- 20% - Somewhat difficult
- 37% - Not very difficult
- 33% - Not at all difficult
- 8% - Very difficult
- 17% - Somewhat difficult
- 40% - Not very difficult
- 35% - Not at all difficult