Year	U.S. dollars (Units)
1990	1908.834
1991	2025.611
1992	2264.913
1993	2099.215
1994	2283.063
1995	2476.947
1996	2406.479
1997	2423.594
1998	2189.317
1999	2118.411
2000	2156.030
2001	1954.968
2002	1825.849
2003	2630.110
2004	3470.147
2005	3742.509
2006	3870.937
2007	4378.564
2008	4198.550
2009	4340.183
2010	5410.977
2011	5870.933
2012	6038.862
2013	5540.619
2014	5555.930
2015	5020.473
2016	4611.508
2017	5438.761
2018	5666.273
2019	5099.427
2020	4225.729
2021	4879.203
2022	4854.445
2023	4664.713
2024	4745.256
2025	4924.524
2026	5110.055
2027	5282.398
2028	5450.463
2029	5624.022