| Value | Category | Cases | |
|---|---|---|---|
| -98 | Don't Know / Don't Recall | 1129 |
3.7%
|
| 1952 | 2 |
0%
|
|
| 1954 | 1 |
0%
|
|
| 1955 | 1 |
0%
|
|
| 1956 | 4 |
0%
|
|
| 1957 | 3 |
0%
|
|
| 1958 | 1 |
0%
|
|
| 1959 | 3 |
0%
|
|
| 1960 | 16 |
0.1%
|
|
| 1961 | 2 |
0%
|
|
| 1962 | 5 |
0%
|
|
| 1963 | 4 |
0%
|
|
| 1964 | 3 |
0%
|
|
| 1965 | 8 |
0%
|
|
| 1967 | 4 |
0%
|
|
| 1968 | 4 |
0%
|
|
| 1969 | 14 |
0%
|
|
| 1970 | 21 |
0.1%
|
|
| 1971 | 4 |
0%
|
|
| 1972 | 16 |
0.1%
|
|
| 1973 | 9 |
0%
|
|
| 1974 | 11 |
0%
|
|
| 1975 | 4 |
0%
|
|
| 1976 | 6 |
0%
|
|
| 1977 | 10 |
0%
|
|
| 1978 | 14 |
0%
|
|
| 1979 | 12 |
0%
|
|
| 1980 | 40 |
0.1%
|
|
| 1981 | 14 |
0%
|
|
| 1982 | 12 |
0%
|
|
| 1983 | 16 |
0.1%
|
|
| 1984 | 22 |
0.1%
|
|
| 1985 | 34 |
0.1%
|
|
| 1986 | 35 |
0.1%
|
|
| 1987 | 15 |
0%
|
|
| 1988 | 27 |
0.1%
|
|
| 1989 | 31 |
0.1%
|
|
| 1990 | 67 |
0.2%
|
|
| 1991 | 20 |
0.1%
|
|
| 1992 | 33 |
0.1%
|
|
| 1993 | 22 |
0.1%
|
|
| 1994 | 38 |
0.1%
|
|
| 1995 | 52 |
0.2%
|
|
| 1996 | 63 |
0.2%
|
|
| 1997 | 45 |
0.1%
|
|
| 1998 | 67 |
0.2%
|
|
| 1999 | 85 |
0.3%
|
|
| 2000 | 162 |
0.5%
|
|
| 2001 | 51 |
0.2%
|
|
| 2002 | 70 |
0.2%
|
|
| 2003 | 80 |
0.3%
|
|
| 2004 | 121 |
0.4%
|
|
| 2005 | 115 |
0.4%
|
|
| 2006 | 74 |
0.2%
|
|
| 2007 | 103 |
0.3%
|
|
| 2008 | 154 |
0.5%
|
|
| 2009 | 179 |
0.6%
|
|
| 2010 | 170 |
0.6%
|
|
| 2011 | 135 |
0.4%
|
|
| 2012 | 157 |
0.5%
|
|
| 2013 | 211 |
0.7%
|
|
| 2014 | 305 |
1%
|
|
| 2015 | 378 |
1.2%
|
|
| 2016 | 427 |
1.4%
|
|
| 2017 | 659 |
2.2%
|
|
| 2018 | 2157 |
7.1%
|
|
| 2019 | 22530 |
74.4%
|
|
| Sysmiss | 316 |