2018

$1,320

$5,280

2017

$1,300

$5,200

2016

$1,260

$5,040

2015

$1,220

$4,880

2014

$1,200

$4,800

2013

$1,160

$4,640

2012

$1,130

$4,520

2010 – 2011

$1,120

$4,480

2009

$1,090

$4,360

2008

$1,050

$4,200

2007

$1,000

$4,000

2006

$970

$3880

2005

$920

$3680

2004

$900

$3600

2003

$890

$3560

2002

$870

$3480

2001

$830

$3320

2000

$780

$3120

1999

$740

$2960

1998

$700

$2800

1997

$670

$2680

1996

$640

$2560

1995

$630

$2520

1994

$620

$2480

1993

$590

$2360

1992

$570

$2280

1991

$540

$2160

1990

$520

$2080

1989

$500

$2000

1988

$470

$1880

1987

$460

$1840

1986

$440

$1760

1985

$410

$1640

1984

$390

$1560

1983

$370

$1480

1982

$340

$1360

1981

$310

$1240

1980

$290

$1160

1979

$260

$1040

1978

$250

$1000