Year	current US$
1990	3487496.80224923
1991	3511048.88726449
1992	3449103.13823805
1993	3319323.36050925
1994	3219855.17148324
1995	3242118.39882834
1996	3107778.86137096
1997	3079519.78444282
1998	3071949.16767652
1999	3075528.67318405
2000	2954845.56889172
2001	2787905.38781461
2002	2694450.69037675
2003	2754897.81078388
2004	2740955.12239019
2005	2932152.79257615
2006	3050223.79519746
2007	3148595.89222106
2008	3215679.21235388
2009	3175236.57052218
2010	3301653.88040308
2011	3426764.56113929
2012	3627997.20851084
2013	4070408.14592018
2014	4386558.67313771
2015	4746316.35495068
2016	4720863.40716658
2017	4844830.9965299
2018	5053286.88722025
2019	5242132.70988432
2020	4976397.39174843
2021	4955448.64326329