Year	U.S. dollars (Units)
1986	26.842
1987	17.871
1988	34.048
1989	41.457
1990	104.240
1991	225.192
1992	263.638
1993	253.183
1994	276.757
1995	333.643
1996	330.146
1997	315.505
1998	279.689
1999	306.664
2000	313.224
2001	345.368
2002	368.731
2003	406.869
2004	465.695
2005	550.210
2006	639.874
2007	763.623
2008	903.246
2009	912.750
2010	992.085
2011	1133.384
2012	1241.402
2013	1356.991
2014	1485.892
2015	1606.561
2016	1735.785
2017	1888.070
2018	2097.235
2019	2281.377
2020	2122.700
2021	2187.734
2022	2319.190
2023	2460.351
2024	2627.767
2025	2807.731
2026	3001.602
2027	3205.566
2028	3417.140
2029	3633.077