Year	U.S. dollars (Units)
1992	52.622
1993	121.645
1994	147.923
1995	100.448
1996	183.374
1997	192.580
1998	222.282
1999	177.712
2000	159.417
2001	167.035
2002	187.958
2003	236.394
2004	308.844
2005	337.129
2006	401.586
2007	519.025
2008	702.445
2009	666.024
2010	738.287
2011	834.520
2012	949.648
2013	1040.150
2014	1105.197
2015	919.073
2016	800.645
2017	844.595
2018	852.341
2019	893.318
2020	858.445
2021	925.135
2022	1066.747
2023	1183.908
2024	1271.387
2025	1362.682
2026	1461.976
2027	1567.952
2028	1675.094
2029	1790.111