{"entity":{"iso2":"US","iso3":"USA","name":"United States","slug":"united-states"},"indicator":{"licence":"CC BY 4.0 (Our World in Data)","slug":"rate-of-twin-deliveries","source":"Our World in Data","source_url":"https://ourworldindata.org/grapher/rate-of-twin-deliveries","title":"Rate of twin deliveries","unit":null},"observations":[{"date":"1915-01-01","value":0.998},{"date":"1916-01-01","value":1.003},{"date":"1917-01-01","value":1.074},{"date":"1918-01-01","value":1.137},{"date":"1919-01-01","value":1.202},{"date":"1920-01-01","value":1.154},{"date":"1921-01-01","value":1.181},{"date":"1922-01-01","value":1.155},{"date":"1923-01-01","value":1.161},{"date":"1924-01-01","value":1.145},{"date":"1925-01-01","value":1.11},{"date":"1926-01-01","value":1.137},{"date":"1927-01-01","value":1.166},{"date":"1928-01-01","value":1.16},{"date":"1929-01-01","value":1.182},{"date":"1930-01-01","value":1.145},{"date":"1931-01-01","value":1.151},{"date":"1932-01-01","value":1.171},{"date":"1933-01-01","value":1.166},{"date":"1934-01-01","value":1.16},{"date":"1935-01-01","value":1.133},{"date":"1936-01-01","value":1.158},{"date":"1937-01-01","value":1.141},{"date":"1938-01-01","value":1.133},{"date":"1939-01-01","value":1.111},{"date":"1940-01-01","value":1.069},{"date":"1941-01-01","value":1.063},{"date":"1942-01-01","value":1.048},{"date":"1943-01-01","value":1.014},{"date":"1944-01-01","value":1.033},{"date":"1945-01-01","value":1.056},{"date":"1946-01-01","value":1.131},{"date":"1947-01-01","value":1.045},{"date":"1948-01-01","value":1.036},{"date":"1949-01-01","value":1.035},{"date":"1950-01-01","value":1.073},{"date":"1951-01-01","value":1.03},{"date":"1952-01-01","value":1.054},{"date":"1953-01-01","value":1.075},{"date":"1954-01-01","value":1.062},{"date":"1955-01-01","value":1.076},{"date":"1956-01-01","value":1.049},{"date":"1957-01-01","value":1.031},{"date":"1958-01-01","value":1.042},{"date":"1959-01-01","value":1.029},{"date":"1960-01-01","value":1.014},{"date":"1961-01-01","value":1.005},{"date":"1962-01-01","value":0.972},{"date":"1963-01-01","value":0.986},{"date":"1964-01-01","value":0.99},{"date":"1965-01-01","value":1.002},{"date":"1966-01-01","value":0.985},{"date":"1967-01-01","value":0.98},{"date":"1968-01-01","value":1.0},{"date":"1971-01-01","value":0.898},{"date":"1972-01-01","value":0.916},{"date":"1973-01-01","value":0.913},{"date":"1974-01-01","value":0.924},{"date":"1975-01-01","value":0.95},{"date":"1976-01-01","value":0.967},{"date":"1977-01-01","value":0.954},{"date":"1978-01-01","value":0.972},{"date":"1979-01-01","value":0.966},{"date":"1980-01-01","value":0.955},{"date":"1981-01-01","value":0.975},{"date":"1982-01-01","value":0.983},{"date":"1983-01-01","value":1.004},{"date":"1984-01-01","value":1.004},{"date":"1985-01-01","value":1.036},{"date":"1986-01-01","value":1.07},{"date":"1987-01-01","value":1.085},{"date":"1988-01-01","value":1.104},{"date":"1989-01-01","value":1.128},{"date":"1990-01-01","value":1.142},{"date":"1991-01-01","value":1.167},{"date":"1992-01-01","value":1.188},{"date":"1993-01-01","value":1.221},{"date":"1994-01-01","value":1.244},{"date":"1995-01-01","value":1.257},{"date":"1996-01-01","value":1.313},{"date":"1997-01-01","value":1.362},{"date":"1998-01-01","value":1.426},{"date":"1999-01-01","value":1.466},{"date":"2000-01-01","value":1.489},{"date":"2001-01-01","value":1.531},{"date":"2002-01-01","value":1.582},{"date":"2003-01-01","value":1.6},{"date":"2004-01-01","value":1.636},{"date":"2005-01-01","value":1.636},{"date":"2006-01-01","value":1.635},{"date":"2007-01-01","value":1.638},{"date":"2008-01-01","value":1.661},{"date":"2009-01-01","value":1.691},{"date":"2010-01-01","value":1.687},{"date":"2011-01-01","value":1.69},{"date":"2012-01-01","value":1.687},{"date":"2013-01-01","value":1.713},{"date":"2014-01-01","value":1.727},{"date":"2015-01-01","value":1.703},{"date":"2016-01-01","value":1.699},{"date":"2017-01-01","value":1.693},{"date":"2018-01-01","value":1.657},{"date":"2019-01-01","value":1.632},{"date":"2020-01-01","value":1.581},{"date":"2021-01-01","value":1.583}],"summary":{"latest_period":"2021-01-01","latest_value":1.583,"max":1.727,"mean":1.20152,"min":0.898,"of":23,"rank":6,"trend":"rising"}}