million tonnes, crude steel production million tonnes, crude steel production Average growth rates % per annum Years World 1950-55 1955-60 1960-65 1965-70 1970-75 1975-80 1980-85 1985-90 1990-95 1995-00 2000-05 2005-10 2010-15 2015-20 7.4 5.1 5.6 5.5