2007
$1,000.00
2010
2015
$560.00
2019
$200.00
2017
$175.00
2016
$150.00
2013
$128.00
2014
$120.00
October 2018
$100.00
$95.00
$90.00
$89.95
2009
$85.00
$80.00
$75.00
2018
1999, sixth edition
2012
2011
$70.00
$69.95
$68.00
$65.00
2005
1998
2008
$60.00
$59.95
$55.00
2013. Reprint edition 2015
$53.00
$52.00
$50.00
2004
2003
2006
$49.95
$45.00
2002
$40.00
1999
$39.95
$39.00
$35.00
$34.95
1994
$33.00
$30.00
2000
$29.95
$29.50
$28.00
$27.95
$27.50
$26.95
$25.00
1989
$24.95
$24.50
$23.96
$22.00
$20.00
1995
$19.95
$18.95
$18.00
$15.00
1991
$14.95
$14.00
$5.00
2002; reprinted 2016