Year	US Dollars adjusted for inflation)
1991	4650.658
1992	4933.632
1993	5275.968
1994	5733.601
1995	6103.164
1996	6553.489
1997	7025.965
1998	7113.317
1999	7283.101
2000	7354.349
2001	7497.963
2002	7677.547
2003	7663.325
2004	7869.107
2005	7795.331
2006	7939.79
2007	8354.731
2008	8542.135
2009	8701.514
2010	8965.237
2011	9276.975
2012	9578.275
2013	9892.908
2014	10133.384
2015	10299.927
2016	10474.325
2017	10797.975
2018	11093.188
2019	11410.599
2020	12188.698
2021	13058.133
2022	13992.396