An Index to Blessing Instruments
| 1906 | 1 |
| 1935 | 28000 |
| 1946 Sept. | 41509 |
| 1947 | 41602 |
| 1948 | 44398 |
| 1949 | 47194 |
| 1950 | 49990 |
| 1950 June | 52001 |
| 1951 June | 55220 |
| 1952 June | 58400 |
| 1953 June | 61600 |
| 1954 June | 64800 |
| 1955 June | 68001 |
| 1956 June | 73000 |
| 1957 June | 78000 |
| 1958 June | 83000 |
| 1959 June | 88000 |
| 1960 June | 93001 |
| 1961 | 98370 |
| 1962 | 109110 |
| 1963 | 119850 |
| 1964 | 130551 |
| 1965 | 137395 |
| 1966 | 144239 |
| 1967 | 151083 |
| 1968 | 157927 |
| 1969 | 164771 |
| 1970 | 171617 |
| 1971 | 180890 |
| 1972 | 190168 |
| 1973 | 199444 |
| 1974 | 208720 |
| 1975 | 218001 |
| 1976 | 230645 |
| 1977 | 243289 |
| 1978 | 255933 |
| 1979 | 268577 |
| 1980 | 281221 |
