Year	U.S. dollars (Units)
1992	632.992
1993	1022.375
1994	1725.207
1995	2163.747
1996	2419.562
1997	2670.492
1998	2961.556
1999	3140.581
2000	3343.184
2001	3553.667
2002	4120.691
2003	5121.736
2004	6342.835
2005	7569.831
2006	9690.458
2007	14079.584
2008	16435.210
2009	12243.072
2010	11316.932
2011	13371.012
2012	13786.588
2013	14927.223
2014	15685.979
2015	13728.365
2016	14259.249
2017	15626.275
2018	17806.560
2019	17828.071
2020	18013.227
2021	20847.701
2022	21566.931
2023	23153.479
2024	24193.744
2025	25739.259
2026	27112.523
2027	28543.730
2028	30051.961
2029	31619.005