"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	10	9.5	8	7	6	5	4	3	2.6	2.4	2	1.7	1959
