Year	U.S. dollars (Units)
1992	209.573
1993	315.613
1994	366.873
1995	561.752
1996	754.528
1997	772.325
1998	773.322
1999	868.991
2000	702.209
2001	587.633
2002	481.995
2003	499.329
2004	585.221
2005	689.391
2006	811.157
2007	1048.715
2008	1324.540
2009	1523.417
2010	1777.487
2011	2067.524
2012	2284.525
2013	2440.258
2014	2651.384
2015	2761.290
2016	2712.808
2017	1932.763
2018	1618.967
2019	1812.738
2020	1776.267
2021	2013.971
2022	2301.214
2023	2522.757
2024	2665.812
2025	2930.961
2026	3219.907
2027	3527.467
2028	3865.305
2029	4198.041