| Graphs |
Bar charts are proportional to percentage, and scaled.
| Publication Year | Count | Percent | |
|---|---|---|---|
| 1943 | 1 | 0.0 | |
| 1944 | 0 | 0.0 | |
| 1945 | 0 | 0.0 | |
| 1946 | 0 | 0.0 | |
| 1947 | 0 | 0.0 | |
| 1948 | 1 | 0.0 | |
| 1949 | 0 | 0.0 | |
| 1950 | 4 | 0.0 | |
| 1951 | 9 | 0.1 | |
| 1952 | 35 | 0.4 | |
| 1953 | 24 | 0.3 | |
| 1954 | 43 | 0.5 | |
| 1955 | 27 | 0.3 | |
| 1956 | 44 | 0.5 | |
| 1957 | 39 | 0.4 | |
| 1958 | 54 | 0.6 | |
| 1959 | 59 | 0.6 | |
| 1960 | 83 | 0.9 | |
| 1961 | 97 | 1.0 | |
| 1962 | 109 | 1.2 | |
| 1963 | 80 | 0.8 | |
| 1964 | 112 | 1.2 | |
| 1965 | 111 | 1.2 | |
| 1966 | 93 | 1.0 | |
| 1967 | 97 | 1.0 | |
| 1968 | 128 | 1.4 | |
| 1969 | 108 | 1.1 | |
| 1970 | 105 | 1.1 | |
| 1971 | 118 | 1.2 | |
| 1972 | 140 | 1.5 | |
| 1973 | 134 | 1.4 | |
| 1974 | 149 | 1.6 | |
| 1975 | 163 | 1.7 | |
| 1976 | 212 | 2.2 | |
| 1977 | 185 | 2.0 | |
| 1978 | 222 | 2.4 | |
| 1979 | 232 | 2.5 | |
| 1980 | 229 | 2.4 | |
| 1981 | 229 | 2.4 | |
| 1982 | 258 | 2.7 | |
| 1983 | 270 | 2.9 | |
| 1984 | 254 | 2.7 | |
| 1985 | 235 | 2.5 | |
| 1986 | 216 | 2.3 | |
| 1987 | 263 | 2.8 | |
| 1988 | 217 | 2.3 | |
| 1989 | 241 | 2.6 | |
| 1990 | 229 | 2.4 | |
| 1991 | 249 | 2.6 | |
| 1992 | 242 | 2.6 | |
| 1993 | 256 | 2.7 | |
| 1994 | 212 | 2.2 | |
| 1995 | 247 | 2.6 | |
| 1996 | 259 | 2.7 | |
| 1997 | 277 | 2.9 | |
| 1998 | 277 | 2.9 | |
| 1999 | 303 | 3.2 | |
| 2000 | 279 | 3.0 | |
| 2001 | 260 | 2.8 | |
| 2002 | 288 | 3.0 | |
| 2003 | 299 | 3.2 | |
| 2004 | 269 | 2.8 | |
| 2005 | 70 | 0.7 |
Items: 63