| Value | Category | Cases | |
|---|---|---|---|
| 1 | Do not know | 1172 |
44.9%
|
| 2 | Year(YYYY) | 0 |
0%
|
| 1967 | 5 |
0.2%
|
|
| 1972 | 4 |
0.2%
|
|
| 1973 | 2 |
0.1%
|
|
| 1974 | 2 |
0.1%
|
|
| 1975 | 14 |
0.5%
|
|
| 1976 | 2 |
0.1%
|
|
| 1979 | 15 |
0.6%
|
|
| 1980 | 3 |
0.1%
|
|
| 1981 | 7 |
0.3%
|
|
| 1982 | 24 |
0.9%
|
|
| 1983 | 3 |
0.1%
|
|
| 1984 | 5 |
0.2%
|
|
| 1985 | 19 |
0.7%
|
|
| 1986 | 12 |
0.5%
|
|
| 1988 | 13 |
0.5%
|
|
| 1989 | 13 |
0.5%
|
|
| 1990 | 12 |
0.5%
|
|
| 1992 | 3 |
0.1%
|
|
| 1993 | 11 |
0.4%
|
|
| 1994 | 25 |
1%
|
|
| 1995 | 18 |
0.7%
|
|
| 1996 | 33 |
1.3%
|
|
| 1997 | 31 |
1.2%
|
|
| 1998 | 28 |
1.1%
|
|
| 1999 | 36 |
1.4%
|
|
| 2000 | 86 |
3.3%
|
|
| 2001 | 35 |
1.3%
|
|
| 2002 | 39 |
1.5%
|
|
| 2003 | 52 |
2%
|
|
| 2004 | 48 |
1.8%
|
|
| 2005 | 64 |
2.4%
|
|
| 2006 | 36 |
1.4%
|
|
| 2007 | 45 |
1.7%
|
|
| 2008 | 66 |
2.5%
|
|
| 2009 | 79 |
3%
|
|
| 2010 | 176 |
6.7%
|
|
| 2011 | 141 |
5.4%
|
|
| 2012 | 177 |
6.8%
|
|
| 2013 | 57 |
2.2%
|
|
| Sysmiss | 14768 |