Year	U.S. dollars (Units)
1996	952.331
1997	1225.456
1998	1415.096
1999	1540.514
2000	1480.624
2001	1540.266
2002	1785.289
2003	2254.449
2004	2699.054
2005	2903.602
2006	3306.785
2007	4073.011
2008	4984.537
2009	4711.119
2010	4633.861
2011	5089.853
2012	4773.164
2013	5141.572
2014	5252.939
2015	4662.977
2016	4875.228
2017	5230.130
2018	5859.283
2019	5867.260
2020	5800.390
2021	6800.487
2022	7064.286
2023	7856.628
2024	8415.970
2025	8926.879
2026	9439.673
2027	9938.657
2028	10456.047
2029	11077.538