Year	U.S. dollars (Units)
1990	898.741
1991	1002.023
1992	1026.904
1993	852.513
1994	872.712
1995	912.587
1996	904.326
1997	854.319
1998	812.206
1999	773.412
2000	673.361
2001	641.849
2002	634.588
2003	711.709
2004	796.923
2005	963.498
2006	1357.425
2007	1425.466
2008	1647.288
2009	1475.591
2010	1715.923
2011	2012.828
2012	1946.079
2013	2072.492
2014	1826.780
2015	1668.065
2016	1690.813
2017	1758.542
2018	1882.203
2019	1945.050
2020	2040.677
2021	2152.336
2022	2260.990
2023	2379.854
2024	2346.945
2025	2453.220
2026	2523.586
2027	2590.562
2028	2639.728
2029	2608.223