Year	U.S. dollars (Units)
1998	1655.952
1999	1509.117
2000	1552.030
2001	1557.508
2002	1638.535
2003	1927.085
2004	2341.911
2005	2704.296
2006	2850.163
2007	3121.319
2008	3733.905
2009	3348.774
2010	3658.418
2011	3969.173
2012	4088.771
2013	4182.937
2014	4153.039
2015	4260.583
2016	4325.408
2017	4496.277
2018	4390.958
2019	4472.223
2020	4308.015
2021	4150.674
2022	4064.061
2023	4478.194
2024	4839.664
2025	5096.051
2026	5297.464
2027	5458.296
2028	5609.656
2029	5772.242