1920s

1921
1922
1923- June
1923- August
1924- May
1924-August
1925- August
1926- May
1926- August
1927- May
1927- August
1928- June
1928- August
1929- May
1929- August

1930s

1930- May
1930- August
1931-May
1931- August
1932- June
1932- August
1933- June
1934- August
1935- June
1935- August
1936- May
1936- May(2)
1936- August
1937- May
1937- May(2)
1938- June
1938- August
1939- May
1939- August

1940s

1940- May
1940- August
1941- May
1941- August
1942- May
1942- August
1943- May
1943- August
1943- August(2)
1944- May
1944- August
1945- May
1945- August
1946- May
1946- August
1947- May
1947- August
1948
1948-May
1948-August
1949-May
1949-August

1960s

1960-May
1960- August
1961-May
1961- August
1962-May
1962- August
1963-May
1963- August
1964- August
1965-May
1966-May
1966- August
1969-May
1969- August

1970s

1970-May
1971-May
1972- August
1973-May
1974-May
1976-August
1977-May
1978-May

1980s

1982-May
1983-May
1984-December
1985-May
1985-December
1986-May
1986-August
1987-May
1987-August
1988-May
1988-August
1988-December
1989-May
1989-August
1989-December

2000s

2000-May
2000-August
2000-December
2001-May
2001-August
2001-December
2002-May
2002-August
2002-December
2003-May
2003-August
2003-December
2004-May
2004-August
2004-December
2004-May
2004-August
2004-December
2005-May
2005-August
2005-December
2006-May
2006-August
2006-December
2007-May
2007-August
2007-December
2008-May
2008-August
2008-December
2009-May
2009-August
2009-December

2010s

2010-May
2010-August
2010-December
2011-May
2011-August
2011-December
2012-May
2012-August
2012-December
2013-May
2013-August
2013-December
2014-May
2014-August
2014-December