Year	Millions of Persons
1960-01-01	23.87
1961-01-01	24.15
1962-01-01	24.28
1963-01-01	24.34
1964-01-01	24.67
1965-01-01	24.92
1966-01-01	24.98
1967-01-01	24.69
1968-01-01	24.58
1969-01-01	24.59
1970-01-01	24.52
1971-01-01	24.51
1972-01-01	24.58
1973-01-01	24.97
1974-01-01	25.03
1975-01-01	24.93
1976-01-01	24.79
1977-01-01	24.81
1978-01-01	24.94
1979-01-01	25.20
1980-01-01	25.09
1981-01-01	24.43
1982-01-01	23.95
1983-01-01	23.78
1984-01-01	24.29
1985-01-01	24.59
1986-01-01	24.75
1987-01-01	25.24
1988-01-01	26.07
1989-01-01	26.75
1990-01-01	26.87
1991-01-01	26.16
1992-01-01	25.54
1993-01-01	25.30
1994-01-01	25.50
1995-01-01	25.82
1996-01-01	26.06
1997-01-01	26.53
1998-01-01	26.80
1999-01-01	27.17
2000-01-01	27.48
2001-01-01	27.71
2002-01-01	27.92
2003-01-01	28.18
2004-01-01	28.48
2005-01-01	28.77
2006-01-01	29.03
2007-01-01	29.23
2008-01-01	29.44
2009-01-01	28.96
2010-01-01	29.04
2011-01-01	29.18