Year Thousands of Persons 1962-01-01 12711.63 1963-01-01 12729.74 1964-01-01 12659.55 1965-01-01 12683.49 1966-01-01 12549.90 1967-01-01 12141.06 1968-01-01 12177.29 1969-01-01 12320.90 1970-01-01 12397.24 1971-01-01 12477.45 1972-01-01 12627.53 1973-01-01 12821.60 1974-01-01 12746.56 1975-01-01 12430.87 1976-01-01 12327.37 1977-01-01 12260.09 1978-01-01 12324.78 1979-01-01 12495.56 1980-01-01 12725.54 1981-01-01 12691.58 1982-01-01 12559.93 1983-01-01 12414.05 1984-01-01 12495.56 1985-01-01 12616.21 1986-01-01 12826.78 1987-01-01 13018.26 1988-01-01 13735.35 1989-01-01 13874.76 1990-01-01 15137.19 1991-01-01 15539.50 1992-01-01 15302.75 1993-01-01 15147.75 1994-01-01 15068.00 1995-01-01 15205.00 1996-01-01 15303.00 1997-01-01 15295.25 1998-01-01 15600.00 1999-01-01 15805.25 2000-01-01 15992.00 2001-01-01 16143.75 2002-01-01 16182.50 2003-01-01 16174.75 2004-01-01 16357.00 2005-01-01 16398.03 2006-01-01 16836.85 2007-01-01 17243.55 2008-01-01 17508.50 2009-01-01 17655.20 2010-01-01 17846.20 2011-01-01 18334.40