Year	US Dollars adjusted for inflation)
1997	3056198617.26936
1998	3205952440.8412
1999	2904592990.64469
2000	2994635298.32715
2001	3027571540.48529
2002	3085214319.79274
2003	3161809839.69264
2004	3301753041.11222
2005	3439786272.06896
2006	3734452817.0891
2007	3988772816.71799
2008	4276873750.45901
2009	4029024664.44174
2010	4139192052.98013
2011	4272823668.91115
2012	4156441921.56952
2013	4303954754.34526
2014	4380723652.46725
2015	4529248373.3755
2016	4662831375.96385
2017	4863333314.24463