Year	Millions of Persons
1971-01-01	13.79
1972-01-01	13.94
1973-01-01	14.28
1974-01-01	14.36
1975-01-01	14.10
1976-01-01	13.95
1977-01-01	13.84
1978-01-01	13.47
1979-01-01	13.18
1980-01-01	12.88
1981-01-01	12.57
1982-01-01	12.47
1983-01-01	12.42
1984-01-01	12.14
1985-01-01	12.02
1986-01-01	12.30
1987-01-01	12.89
1988-01-01	13.34
1989-01-01	13.82
1990-01-01	14.35
1991-01-01	14.52
1992-01-01	14.32
1993-01-01	13.91
1994-01-01	13.85
1995-01-01	14.11
1996-01-01	14.31
1997-01-01	14.73
1998-01-01	15.30
1999-01-01	15.86
2000-01-01	16.41
2001-01-01	16.94
2002-01-01	17.36
2003-01-01	17.92
2004-01-01	18.56
2005-01-01	19.33
2006-01-01	20.10
2007-01-01	20.71
2008-01-01	20.68
2009-01-01	19.29
2010-01-01	18.79
2011-01-01	18.41