Year	US Dollars adjusted for inflation)
1991	2225.942
1992	2371.144
1993	2468.763
1994	2639.194
1995	2854.51
1996	2947.211
1997	3005.373
1998	3053.446
1999	3142.314
2000	3196.156
2001	3242.825
2002	3349.787
2003	3369.658
2004	3376.08
2005	3441.697
2006	3517.376
2007	4010.579
2008	4062.816
2009	4202.794
2010	4648.858
2011	5011.567
2012	5253.98
2013	5233.751
2014	5535.948
2015	5567.412
2016	5797.348
2017	6117.723
2018	6603.883
2019	6935.547
2020	7263.226
2021	7599.066
2022	7933.682