year started as interviewer for NatCen
| Value label | Value | Absolute frequency | Relative frequency |
|---|---|---|---|
| -9 | 1.00 | 0.64% | |
| 1990 | 1.00 | 0.64% | |
| 1992 | 1.00 | 0.64% | |
| 1993 | 1.00 | 0.64% | |
| 1994 | 3.00 | 1.91% | |
| 1995 | 2.00 | 1.27% | |
| 1996 | 2.00 | 1.27% | |
| 1997 | 1.00 | 0.64% | |
| 1998 | 6.00 | 3.82% | |
| 2000 | 1.00 | 0.64% | |
| 2001 | 4.00 | 2.55% | |
| 2002 | 11.00 | 7.01% | |
| 2003 | 10.00 | 6.37% | |
| 2004 | 7.00 | 4.46% | |
| 2006 | 3.00 | 1.91% | |
| 2007 | 3.00 | 1.91% | |
| 2008 | 40.00 | 25.48% | |
| 2009 | 2.00 | 1.27% | |
| 2010 | 42.00 | 26.75% | |
| 2011 | 16.00 | 10.19% | |
| Total | 157.00 | 100.00% |
