1980 5,474,607

1981 5,477,264

1982 5,410,479

1983 5,379,477

1984 5,444,204

1985 5,651,614

1986 5,859,208

1987 6,047,121

1988 6,163,800

1989 6,244,693

1990 6,382,124

1991 6,400,518

1992 6,548,193

1993 6,792,476

1994 7,015,322

1995 7,256,850

1996 7,287,401

1997 7,439,746

1998 7,367,614

1999 6,968,988

2000 7,066,731

2001 7,094,110

2002 7,181,132

2003 7,369,782

2004 7,667,721

2005 7,931,078

2006 8,361,471

2007 8,832,449

2008 9,037,907

2009 9,079,326

2010 9,329,796

2011 9,829,037

2012 10,109,119

2013 10,460,983