Year	U.S. dollars (Units)
1990	1288.653
1991	1324.852
1992	722.215
1993	352.304
1994	419.198
1995	647.441
1996	592.439
1997	511.954
1998	480.917
1999	445.544
2000	473.198
2001	521.317
2002	566.403
2003	639.373
2004	789.958
2005	989.177
2006	1321.606
2007	1616.138
2008	2109.269
2009	1687.550
2010	2602.373
2011	3702.359
2012	4281.330
2013	4293.834
2014	4081.015
2015	3800.110
2016	3575.095
2017	3612.716
2018	4078.182
2019	4309.049
2020	3965.097
2021	4482.853
2022	4959.141
2023	5668.351
2024	6181.886
2025	6541.563
2026	6975.961
2027	7395.987
2028	7832.809
2029	8295.437