Year	U.S. dollars (Units)
2000	420.946
2001	539.594
2002	520.990
2003	534.192
2004	471.231
2005	483.242
2006	462.124
2007	538.952
2008	628.632
2009	689.276
2010	819.147
2011	947.257
2012	1031.000
2013	1213.652
2014	1233.580
2015	1332.672
2016	1358.283
2017	1309.352
2018	1264.501
2019	1611.123
2020	1676.769
2021	2764.355
2022	2406.607
2023	1730.627
2024	1453.668
2025	1540.034
2026	1627.065
2027	1717.616
2028	1813.636
2029	1915.582