| I'm on one right now!: 71 (1.6%) |  |
| Within the past 2 months: 54 (1.2%) | |
| Within the past 6 months: 137 (3.1%) | |
| Within the past 9 months: 133 (3.1%) | |
| Within the past year: 192 (4.4%) | |
| Within the past 18 months: 75 (1.7%) | |
| Within the past 2 years: 136 (3.1%) | |
| Within the past 3 years: 153 (3.5%) | |
| Within the past 4 years: 106 (2.4%) | |
| Within the past 5 years: 121 (2.8%) | |
| Within the past 7 years: 218 (5.0%) | |
| Within the past 10 years: 217 (5.0%) | |
| More than 10 years ago: 671 (15.4%) | |
| Never: 2068 (47.5%) | |
