Yearly event density with release/catalog-offering overlays and catalog-issue counts.
| Year | Total Events | Release | Catalog Offering | Catalog Issues | Density |
|---|---|---|---|---|---|
| 1812 | 2 | 0 | 0 | 0 | |
| 1823 | 1 | 0 | 0 | 0 | |
| 1826 | 1 | 0 | 0 | 0 | |
| 1835 | 1 | 0 | 0 | 0 | |
| 1844 | 3 | 0 | 0 | 0 | |
| 1850 | 1 | 0 | 0 | 0 | |
| 1851 | 1 | 0 | 0 | 0 | |
| 1855 | 2 | 0 | 0 | 0 | |
| 1866 | 3 | 0 | 0 | 0 | |
| 1869 | 4 | 0 | 0 | 0 | |
| 1870 | 2 | 0 | 0 | 0 | |
| 1871 | 1 | 0 | 0 | 0 | |
| 1872 | 1 | 0 | 0 | 0 | |
| 1873 | 1 | 0 | 0 | 0 | |
| 1874 | 2 | 0 | 0 | 0 | |
| 1878 | 1 | 0 | 0 | 0 | |
| 1879 | 1 | 0 | 0 | 0 | |
| 1880 | 1 | 0 | 0 | 0 | |
| 1881 | 1 | 0 | 0 | 0 | |
| 1884 | 1 | 0 | 0 | 0 | |
| 1885 | 3 | 1 | 0 | 0 | |
| 1886 | 4 | 0 | 0 | 0 | |
| 1887 | 1 | 0 | 0 | 0 | |
| 1888 | 3 | 0 | 0 | 0 | |
| 1890 | 1 | 0 | 0 | 0 | |
| 1891 | 2 | 0 | 0 | 0 | |
| 1894 | 3 | 0 | 0 | 0 | |
| 1895 | 6 | 0 | 0 | 0 | |
| 1896 | 2 | 0 | 0 | 0 | |
| 1897 | 9 | 0 | 0 | 0 | |
| 1898 | 2 | 0 | 0 | 0 | |
| 1899 | 2 | 0 | 0 | 0 | |
| 1901 | 3 | 0 | 0 | 0 | |
| 1902 | 8 | 0 | 0 | 0 | |
| 1903 | 4 | 0 | 0 | 0 | |
| 1904 | 13 | 0 | 0 | 0 | |
| 1905 | 7 | 0 | 0 | 0 | |
| 1906 | 4 | 0 | 0 | 0 | |
| 1907 | 15 | 1 | 0 | 0 | |
| 1908 | 11 | 0 | 0 | 0 | |
| 1909 | 21 | 0 | 0 | 0 | |
| 1910 | 2 | 0 | 0 | 0 | |
| 1911 | 28 | 0 | 0 | 0 | |
| 1912 | 5 | 1 | 0 | 0 | |
| 1913 | 2 | 0 | 0 | 0 | |
| 1915 | 12 | 0 | 0 | 0 | |
| 1916 | 2 | 0 | 0 | 0 | |
| 1918 | 2 | 0 | 0 | 0 | |
| 1920 | 6 | 0 | 0 | 0 | |
| 1921 | 1 | 0 | 0 | 0 | |
| 1922 | 1 | 0 | 0 | 0 | |
| 1923 | 6 | 1 | 0 | 0 | |
| 1924 | 1 | 0 | 0 | 0 | |
| 1925 | 10 | 0 | 0 | 0 | |
| 1926 | 1 | 0 | 0 | 0 | |
| 1927 | 12 | 1 | 0 | 0 | |
| 1928 | 1 | 0 | 0 | 0 | |
| 1930 | 11 | 1 | 0 | 0 | |
| 1931 | 4 | 0 | 0 | 0 | |
| 1932 | 5 | 1 | 0 | 0 | |
| 1934 | 5 | 1 | 0 | 0 | |
| 1935 | 2 | 0 | 0 | 0 | |
| 1936 | 12 | 1 | 0 | 0 | |
| 1937 | 2 | 0 | 0 | 0 | |
| 1938 | 2 | 0 | 0 | 0 | |
| 1939 | 1 | 0 | 0 | 0 | |
| 1940 | 29 | 2 | 0 | 0 | |
| 1941 | 10 | 0 | 0 | 0 | |
| 1942 | 3 | 1 | 0 | 0 | |
| 1943 | 11 | 0 | 0 | 0 | |
| 1944 | 11 | 0 | 0 | 0 | |
| 1945 | 23 | 0 | 0 | 0 | |
| 1946 | 20 | 0 | 0 | 0 | |
| 1947 | 2 | 0 | 0 | 0 | |
| 1948 | 1 | 0 | 0 | 0 | |
| 1949 | 1 | 0 | 0 | 0 | |
| 1950 | 16 | 0 | 0 | 0 | |
| 1951 | 5 | 0 | 0 | 0 | |
| 1952 | 5 | 1 | 0 | 0 | |
| 1953 | 1 | 0 | 0 | 0 | |
| 1954 | 1 | 0 | 0 | 0 | |
| 1955 | 5 | 1 | 0 | 0 | |
| 1956 | 3 | 0 | 0 | 0 | |
| 1957 | 6 | 0 | 0 | 0 | |
| 1958 | 4 | 0 | 0 | 0 | |
| 1959 | 20 | 1 | 0 | 0 | |
| 1960 | 45 | 2 | 0 | 0 | |
| 1961 | 2 | 0 | 0 | 0 | |
| 1962 | 2 | 0 | 0 | 0 | |
| 1963 | 1 | 0 | 0 | 0 | |
| 1964 | 9 | 0 | 0 | 0 | |
| 1965 | 1 | 0 | 0 | 0 | |
| 1966 | 1 | 0 | 0 | 0 | |
| 1967 | 5 | 0 | 0 | 0 | |
| 1968 | 3 | 0 | 0 | 0 | |
| 1971 | 1 | 0 | 0 | 0 | |
| 1972 | 1 | 0 | 0 | 0 | |
| 1973 | 5 | 1 | 0 | 0 | |
| 1974 | 4 | 0 | 0 | 0 | |
| 1975 | 15 | 2 | 0 | 0 | |
| 1976 | 16 | 1 | 0 | 0 | |
| 1978 | 2 | 0 | 0 | 0 | |
| 1979 | 18 | 3 | 0 | 0 | |
| 1980 | 18 | 1 | 0 | 0 | |
| 1981 | 5 | 0 | 0 | 0 | |
| 1982 | 3 | 0 | 0 | 0 | |
| 1983 | 20 | 0 | 0 | 0 | |
| 1984 | 1 | 0 | 0 | 0 | |
| 1985 | 15 | 0 | 0 | 0 | |
| 1986 | 16 | 2 | 0 | 0 | |
| 1987 | 1 | 0 | 0 | 0 | |
| 1988 | 1 | 0 | 0 | 0 | |
| 1989 | 3 | 0 | 0 | 0 | |
| 1990 | 18 | 1 | 0 | 0 | |
| 1991 | 16 | 0 | 0 | 0 | |
| 1993 | 4 | 0 | 0 | 0 | |
| 1994 | 1 | 0 | 0 | 0 | |
| 1996 | 3 | 0 | 0 | 0 | |
| 1997 | 2 | 0 | 0 | 0 | |
| 1998 | 4 | 0 | 0 | 0 | |
| 1999 | 31 | 3 | 0 | 0 | |
| 2000 | 2 | 0 | 0 | 0 | |
| 2001 | 4 | 0 | 0 | 0 | |
| 2002 | 6 | 0 | 0 | 0 | |
| 2003 | 12 | 0 | 0 | 0 | |
| 2004 | 8 | 1 | 0 | 0 | |
| 2005 | 2 | 1 | 0 | 0 | |
| 2006 | 8 | 0 | 0 | 0 | |
| 2007 | 22 | 1 | 0 | 0 | |
| 2008 | 26 | 1 | 0 | 0 | |
| 2009 | 10 | 0 | 0 | 0 | |
| 2010 | 11 | 0 | 0 | 0 | |
| 2011 | 13 | 0 | 0 | 0 | |
| 2012 | 19 | 3 | 0 | 0 | |
| 2013 | 6 | 0 | 0 | 0 | |
| 2014 | 8 | 0 | 0 | 0 | |
| 2015 | 8 | 1 | 0 | 0 | |
| 2016 | 13 | 1 | 0 | 0 | |
| 2017 | 12 | 0 | 0 | 0 | |
| 2018 | 7 | 0 | 0 | 0 | |
| 2019 | 1 | 0 | 0 | 0 | |
| 2020 | 2 | 0 | 0 | 0 | |
| 2021 | 1 | 0 | 0 | 0 | |
| 2022 | 2 | 0 | 0 | 0 | |
| 2023 | 1 | 0 | 0 | 0 | |
| 2024 | 4 | 0 | 0 | 0 | |
| 2025 | 1 | 0 | 0 | 0 | |
| 2026 | 6 | 1 | 0 | 0 |