Year	U.S. dollars (Units)
1994	898.199
1995	935.340
1996	947.140
1997	940.143
1998	973.071
1999	999.413
2000	1030.740
2001	1054.660
2002	1011.904
2003	1010.231
2004	1077.784
2005	1152.801
2006	1224.724
2007	1326.658
2008	1498.880
2009	1438.131
2010	1499.068
2011	1652.097
2012	1728.147
2013	1783.560
2014	1909.424
2015	2029.124
2016	2091.463
2017	2147.856
2018	2008.404
2019	1940.115
2020	1952.183
2021	2163.083
2022	2371.681
2023	2608.085
2024	2791.231
2025	2973.508
2026	3167.689
2027	3374.551
2028	3594.921
2029	3829.682