Year	Millions of Persons
1960-01-01	20.92
1961-01-01	21.06
1962-01-01	21.00
1963-01-01	20.65
1964-01-01	20.58
1965-01-01	20.07
1966-01-01	19.75
1967-01-01	19.99
1968-01-01	19.98
1969-01-01	19.84
1970-01-01	19.93
1971-01-01	19.94
1972-01-01	19.89
1973-01-01	20.17
1974-01-01	20.48
1975-01-01	20.50
1976-01-01	20.70
1977-01-01	20.77
1978-01-01	20.84
1979-01-01	21.07
1980-01-01	21.37
1981-01-01	21.36
1982-01-01	21.40
1983-01-01	21.47
1984-01-01	21.47
1985-01-01	21.67
1986-01-01	21.82
1987-01-01	21.87
1988-01-01	22.10
1989-01-01	22.25
1990-01-01	22.61
1991-01-01	23.03
1992-01-01	22.87
1993-01-01	22.25
1994-01-01	21.89
1995-01-01	21.84
1996-01-01	21.97
1997-01-01	22.04
1998-01-01	22.25
1999-01-01	22.49
2000-01-01	22.93
2001-01-01	23.39
2002-01-01	23.79
2003-01-01	24.15
2004-01-01	24.26
2005-01-01	24.40
2006-01-01	24.87
2007-01-01	25.19
2008-01-01	25.26
2009-01-01	24.84
2010-01-01	24.66
2011-01-01	24.74