"country"	"country_code"	"1950-1955"	"1955-1960"	"1960-1965"	"1965-1970"	"1970-1975"	"1975-1980"	"1980-1985"	"1985-1990"	"1990-1995"	"1995-2000"	"2000-2005"	"2005-2010"	"last.observed"
"World"	900	48	53	50.98	54.59	56.59	58.32	59.75	61.18	61.88	63	64.21	65.41	2010
