Year	U.S. dollars (Units)
1992	168.645
1993	304.849
1994	751.980
1995	1061.475
1996	1358.804
1997	1459.416
1998	1480.091
1999	1132.126
2000	1229.000
2001	1490.925
2002	1658.032
2003	2068.126
2004	2874.286
2005	3771.348
2006	5291.550
2007	6771.415
2008	8513.567
2009	7165.226
2010	9070.490
2011	11633.998
2012	12386.701
2013	13890.637
2014	12807.262
2015	10510.769
2016	7715.462
2017	9247.587
2018	9812.626
2019	9812.591
2020	9121.636
2021	10373.791
2022	11486.060
2023	13116.815
2024	14778.424
2025	15425.753
2026	15963.801
2027	16935.074
2028	17692.541
2029	18396.263